+--------+------------+ | length | prime | +--------+------------+ | 6 | 139 | | 7 | 617 | | 8 | 1069 | | 9 | 3389 | | 10 | 11497 | | 11 | 17863 | | 12 | 58013 | | 13 | 136859 | | 14 | 239873 | | 15 | 608789 | | 16 | 1091339 | | 17 | 2899861 | | 18 | 5357603 | | 19 | 13919273 | | 20 | 27700919 | | 21 | 70483537 | | 22 | 122954173 | | 23 | 282097363 | | 24 | 477395357 | | 25 | 1138900957 | -- optimal? | 26 | 1181362571 | | 27 | 1188373009 | | 28 | 1189679171 | | 29 | 1189679201 | | 30 | 1189679021 | | 31 | 1189679069 | | 32 | 1189678981 | | 33 | 1189679173 | | 34 | 1189678879 | | 35 | 1189679063 | | 36 | 1189674401 | | 37 | 1189679041 | | 38 | 1189675369 | | 39 | 1183734623 | | 40 | 1181280767 | | 41 | 1179693209 | | 42 | 1180521577 | | 43 | 1181502713 | | 44 | 1181495831 | | 45 | 1177256659 | | 46 | 1183881169 | | 47 | 1178034049 | | 48 | 1173106679 | | 49 | 1174250113 | | 50 | 1173958369 | | 51 | 1143271561 | | 52 | 1144336033 | | 53 | 1139894929 | | 54 | 1177542911 | | 55 | 1041430153 | | 56 | 1119841529 | | 57 | 1079709649 | | 58 | 1180683001 | | 59 | 634711921 | | 60 | 1146975959 | | 61 | 1054287809 | | 62 | 1180681441 | | 64 | 947815391 | | 66 | 1052665507 | | 68 | 1115616479 | | 72 | 1113314879 | | 74 | 1179613681 | | 76 | 40754999 | | 80 | 688333799 | | 82 | 1177310689 | | 84 | 131486759 | | 86 | 1181277241 | | 94 | 1174448521 | | 106 | 1163729449 | | 118 | 1135352761 | | 122 | 1138435489 | | 134 | 1154733889 | | 142 | 1008273289 | | 158 | 427733329 | | 166 | 898716289 | +--------+------------+ Last updated 22 Feb 2021