The tables currently have 9145 entries from 80 different contributors


last updated at 2018-09-14 15:20:02

Top Contributors

LJCR 3967
Jan de Heer and Steve Muir 3106
Enzo Franzese 396
Colin Barker 321
Michael Dambmann 194
Terenzio Lazzarotto 161
Tommaso Tanto 118
Flavio Perona 79
Anastasios Tampakis 79
Kamal Fadlaoui 73
Pio Leonardi 60
Marco Meoli 48
Jan de Heer 47
Alessandro Jurcovich 37
Mathias Liesener 34
Rade Belic 31
Dietmar Pree 31
Barnabas Toth 27
Kinski and Genivaldo Pereira 26
Andrei Ochmat 23
Vinicius Alves 22
Chaoying Dai, Ben Li and Michel Toulouse 22
Gerald Unger 19
Felix Rodriguez Martin 19
Sveta Marjanovic 18
Rade Belic and Dragan Stojiljkovic 18
Luciano Rezende 18
Rade Belic and Jan de Heer 13
Adolf Muehl 13
Jiang Yong Ming 11
Kleszek 7
Antonio Franzese 7
Karsten Schölzel 6
Enzo Franzese E Alessandro Jurcovich 6
W.h.mills and R.c.mullin 5
Roy Gourgi 5
E. Franzese, A. Jurcovich E M. Meoli 5
Aline Marie Menezes Wanderlei 5
Alessandro Jurcovich E Marco Meoli 5
W.h.mills 4
Jan de Heer and Rade Belic 4
Enzo Franzese E Marco Meoli 4
Sveta Marjanovic and Anastasios Tampakis 3
Daryl Burns 3
Sveta Marjanovicandanastasios Tampakis 2
Steve Muir 2
Mario Pina 2
Marco Meoli E Alessandro Jurcovich 2
Iliya Bluskov 2
Guenther Schlegl 2
Claus Friis 2
Bluskov and Hamalainen 2
Alessandro Jurcovich E Enzo Franzese 2
Weberazevedo 1
Weber Azevedo 1
W. H. Mills 1
Tung Le 1
Stefano de Martino 1
Riccardo Bertolo and Jan de Heer 1
Riccardo Bertolo and Francesco Santisi 1
Rade Belic and Dietmar Pree 1
Nino Aspesi E Enzo Franzese 1
Nino Aspesi - Alessandro Jurcovich 1
Namyk Kemal Erdogan 1
Kinsky and Genivaldo Pereira 1
Karsten Scholzel 1
Jose Milan Vega 1
Jaera 1
Igor Lazebnik 1
Hillary 1
Fausto Peirano 1
Enzo Franzese E Nino Aspesi 1
Dietmar Pree and Rade Belic 1
Dietmar Pree and Adolf Muehl 1
Daniel Morais 1
Chaoying Dai, Ben Li and Michel Toulouse, Reduced By Rade Belic 1
Alexandre Spaeth 1
Adolf Muehl and Dietmar Pree 1
A. Tampakis and A. Jurchovich 1
A. Betten, R. Laue and A. Wassermann 1





Overall there have been 69757 entries from 137 different contributors

All-time Contributors






LJCR 47805
Jan de Heer and Steve Muir 5615
Michael Dambmann 2247
Tommaso Tanto 1799
JCD Article 1632
Flavio Perona 1526
Terenzio Lazzarotto 1500
Rade Belic 1441
Enzo Franzese 1191
Rade Belic and Dragan Stojiljkovic 539
Colin Barker 457
Gerald Unger 343
Kinski and Genivaldo Pereira 278
Anastasios Tampakis 257
Felix Rodriguez Martin 244
Barnabas Toth 228
Marco Meoli 195
Pio Leonardi 194
Aline Marie Menezes Wanderlei 192
Dietmar Pree 179
Alessandro Jurcovich 177
Steve Muir 131
Jan de Heer 129
Francisco Carlos 127
Sveta Marjanovic 120
Luciano Rezende 100
Kamal Fadlaoui 89
Vinicius Alves 86
Nino Aspesi 54
Mathias Liesener 47
Jiang Yong Ming 41
Dietmar Pree and Rade Belic 41
Jose Milan Vega 40
Chaoying Dai, Ben Li and Michel Toulouse 39
Rade Belic and Jan de Heer 38
Jaera 38
Fausto Peirano 38
Enzo Franzese E Alessandro Jurcovich 34
Gino Grazin and Rade Belic 31
Andrei Ochmat 31
Alessandro Jurcovich E Marco Meoli 29
Kleszek 27
Dragan Stojiljkovic 27
Alessandro Jurcovich E Enzo Franzese 26
Marco Meoli E Alessandro Jurcovich 24
Stefano de Martino 23
Enzo Franzese E Marco Meoli 20
Antonio Franzese 20
Jan de Heer and Rade Belic 19
Roy Gourgi 14
Weberazevedo 13
E. Franzese, A. Jurcovich E M. Meoli 13
Kabila 11
Flavio.perona 11
Igor Lazebnik 10
Weber Azevedo 9
Sildemar Castro 8
Adolf Muehl 8
Riccardo Bertolo 7
Daryl Burns 7
Mario Pina 6
Karsten Schölzel 6
W.h.mills and R.c.mullin 5
Sveta Marjanovic and Anastasios Tampakis 5
W.h.mills 4
Sveta Marjanovicandanastasios Tampakis 4
Riccardo Bertolo and Francesco Santisi 4
Rade Belic and Dietmar Pree 4
Leopio 4
Ivan Baptiste and Rade Belic 4
Michael Damb 3
Marco Meoli and Alessandro Jurcovich 3
Hillary 3
Enzo Franzese E Nino Aspesi 3
Claus Friis 3
Alessandro Jurcovich E Stefano de Martino 3
Tarullig / Aspesi 2
Riccardo Bertolo and Jan de Heer 2
Ricardo Ramalho 2
Paolo Ferlaino 2
Meoli Marco 2
Marco Meoli E Enzo Franzese 2
Marco Meoli E Dietmar Pree 2
Karsten Scholzel 2
Iliya Bluskov 2
Genivaldo Pereira 2
Bluskov and Hamalainen 2
Alessandro Jurcovich - Nino Aspesi 2
Adolf Muehl and Dietmar Pree 2
W. H. Mills 1
Tung Le 1
Tarullig/aspesi 1
Steve Muir, Improving One By Jan de Heer 1
Spada Mauro Bellariva 1
Simple Construction: Doubled (50,9,3) and Deleted An Element 1
Simple Construction: Doubled (50,8,3) and Deleted An Element 1
Simple Construction: Doubled (50,8,2) and Deleted An Element 1
Simple Construction: Doubled (50,6,2) and Deleted An Element 1
Simple Construction: Doubled (50,11,3) and Deleted An Element 1
Simple Construction: Doubled (50,11,2) and Deleted An Element 1
Simple Construction: Doubled (50,10,4) and Deleted An Element 1
Simple Construction: Doubled (50,10,3) and Deleted An Element 1
Simple Construction: Doubled (50,10,2) and Deleted An Element 1
Quadrupling Construction 1
Qlatino 1
Peter Rosendahl 1
Paramini and Kabila and Aspesi 1
Nino Aspesi E Enzo Franzese 1
Nino Aspesi - Moreno Paramini 1
Nino Aspesi - Alessandro Jurcovich 1
Namyk Kemal Erdogan 1
Marjanovic Jurcovich Aspesi 1
Mario Tessuto 1
Marco Meoli Sveta Marjanovic 1
Marco Meoli Alessandro Jurcovich 1
Leo Pio 1
Lazzarotto Terenzio 1
Kinsky and Genivaldo Pereira 1
Jose Maria Milan 1
Jan de Heer With Ininuga By Uros Boltin 1
J 1
Grzesiek 1
Gerasorte Online 1
Fernando Villanova 1
Edi8 1
Daniel Morais 1
Chaoying Dai, Ben Li and Michel Toulouse, Reduced By Rade Belic 1
Aspesi - Paramini - Tosi 1
Aspesi - Paramini - Marjanovic 1
Altopalato Bellariva 1
Alexandre Spaeth 1
Alessandro Jurcovich-sveta Marjanovic-marco Meoli 1
Adolf Muehl and Rade Belic And Dietmar Pree 1
A. Tampakis and A. Jurchovich 1
A. Jurcovich, E. Franzese E M. Meoli 1
A. Betten, R. Laue and A. Wassermann 1
42066 1

Methods used in current tables

Private tools 2854
Dynamic programming construction 1545
unknown1512
Simple construction 927
Multiple 617
Lex covering 258
Constructed 223
Simulated annealing 137
Dynamic programming covering 132
Simple construction: multiple 70
Simple construction: combined 69
Simple construction: induced 65
Lexicographic greedy covering 57
Wheel generator 47
Dynamic programming 42
Dynamic construction 40
Simple construction: deleted element 32
Private tool 28
Tabu search 27
Random greedy covering 23
Cyclic covering 23
Cyclic covering found by search program 20
Simple construction: added element to c(v-1,k-1,t) covering 18
Simple optimization 17
Steiner quadruple system 16
Sidorenko construction 14
Jymccdd programming 11
Constructed using simulated annealing 11
Simple combine 10
Design is based on c (v - 1, k, t) = b - v 10
Cyclic construction 10
Simulated annealing covering 9
See paper by jrj abel et al. in discrete mathematics 307 (2007) 9
Cyclic covering found by a search program 9
Nurmela and ostergard simulated annealing cover 8
Nurmela-ostergard symmetric covering 7
Affine geometry covering 7
Induced 6
Exhaustive search 6
Covering provided by rade belic 6
Steiner triple system 5
Sidorenko method 5
See jct series a 49, 308-322 (1988) 5
Extraction/remainder 5
Colex greedy covering 5
Simple construction: added element to c(v,k-1,t) covering 4
See journal 4
Nurmela-ostergard simulated annealing covering design 4
Hanani construction (see canadian journal 4
Cyclic symmetry 4
Constructed using difference families 4
Wheel generator, based on jan de heer and steve muir work 3
Using ininuga, by uros boltin 3
Steiner system 3
Reverse engineering smaller systems 3
Projective plane 3
Mills, jcta 13 (1972) pp. 55-78. 3
Mills, ars combinatoria, 8 (1979) pg. 247 3
Mills, ars combinatoria, 8 (1979) pg. 231 3
Mills, ars combinatoria 8 (1979) pp. 199-315 3
Found by a hill-climbing program 3
Cyclic steiner system 3
Covering provided by alex sidorenko (personal communication) 3
Covering found by a hill-climbing program 3
Constructed using dynamic programming 3
Steiner system (derived) 2
Simple method construction 2
Several methods (including sa) 2
Nurmela-ostergard simulated annealing covering 2
Modified cover32 routine by dietmar pree 2
Jcd 1998, pp. 21-41 2
Hill-climb on cyclic orbits 2
Hill-climb on affine orbits 2
Covering provided by john cock (personal communication) 2
Covering provided by dietmar pree 2
Covering pairs by quads: mills, jcta 15:138-166, 1973. 2
Constructed using difference sets 2
Constructed by simulated annealing 2
Communicated by d. todorov, using pg(2,4) 2
Communicated by d. todorov, using pg(2,3) 2
Affine plane 2
Using td(6,16) and 6*modified c(18,6,2,2) 1
Using td(6,15) and 6*modified c(18,6,2,2) 1
Using resolvable c(72,4,2), see lamken, mullen and rees (jcd, 1997-1) 1
Using resolvable c(68,4,2), see lamken, mullen and rees (jcd, 1997-1) 1
Using rc(60,3,2) by lamken and mills (1993) 1
Using rc(54,3,2) 1
Using rc(45,3,2) 1
Using dietmar pree version 1
Using a resolvable c(54,6,2,2) 1
Using a 4−gdd 1
Using a (v,4,22*)-pbd and c(22,4,2) 1
Unusual methods 1
Tripling a resolvable c(25,5,2) 1
Td(7,13) and 7 * modified c(15,7,2) 1
Td(4,24) + 4*c(27,4,2) 1
Td(4,24) + 4 * c(26,4,2) 1
Td(4,23) + 4 * c(25,4,2) 1
Td(4,19) & 4 * c(21,4,2) 1
Td(4,18) + 4 * c(21,4,2) 1
Td(4,15) and 4 * modified c(18,4,2) 1
Td(4,12) & 4 * c(15,4,2) 1
Superfluous-element hill climb on a random greedy covering 1
Superfluous-element hill climb on a covering 1
Steiner system, taken 1
Simple multiple 1
Simple construction: doubled (50,8,3) and deleted an element 1
Simple construction: doubled (50,8,2) and deleted an element 1
Simple construction: doubled (50,11,2) and deleted an element 1
Simple construction: doubled (50,10,2) and deleted an element 1
Simple construction: 1
See w h mills in congressus numerantium 10 (1974) pp563-581 1
See paper in journal 1
See j comb des , vol. 15, no. 6, pp. 511-533, 2007 1
See designs, codes and cryptography 17 (1999), 181-186 1
Reverse engineering 1
Replicate 4 columns 1
Quadrupling construction 1
Quadrupling a full c(10,5,5) 1
Produced with covermaster (by john rawson), wheelgenerator (by anastasios tampakis) and private tools. 1
Private tools - assisted by wheel generator 1
Privat tools 1
Pritave tools 1
Of,24,15,7,165 1
Normal methods 1
Mills, ars combinatoria, 8 (1979) pg. 270 1
Mills, ars combinatoria, 8 (1979) pg. 254 1
Mill, jcta 15 (1973) 138-166 1
Method 1
Marco meoli 1
Ininuga (by uros boltin) 1
Group theory 1
From td(9,9) and 9*c(14,9,2,2,3) with 5 holes 1
From td(7,12) and 7*c(15,7,2,2,6) with 3 holes 1
From td(7,12) and 7*c(13,7,2,2,5) with 2 holes 1
From 57,8,2 1
From 1-flat on 42 numbers 1
Ex 948 1
Ex 831 1
Ex 8 1
Ex 62 1
Ex 54 1
Ex 28 1
Ex 1988 1
Ex 16 1
Ex 15 1
Ex 13 1
Doubling resolvable c(25,5,2) 1
Doubling c(42,4,3) 1
Doubling c(36,4,3) 1
Doubling c(30,4,3) 1
Doubling c(18,4,3) 1
Cyclic symmetrical 1
Cyclic covering on z5*z7 1
Cyclic covering on z3*z17 with one point at infinity 1
Cyclic 1
Covering provided by konstantin katskov, found by exhaustive search 1
Covering produced by floyd l. oats, using a ranking and reduction process 1
Covering pairs by quints, mullin, jcmcc 2:133-146, 1987 1
Covering pairs by quints, mills & mullin, jcta 49:308-322, 1988 1
Covering found by rade belic 1
Covering found by john rawson 1
Covering 1
Construction combined 1
Communicated by d. todorov 1
Combinado 1
Chain rule (64,32,6)x(32,24,6) 1
Block-array construction (gordon, patashnik, petro and taylor) 1
Block covering 1
Based on work by chaoying dai, ben li and michel toulouse 1
Based on an improvement by dietmar pree 1