Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 680: | \[{8^{680}-1\over7}\] | 32 × 52 × 11 × 13 × 172 × 31 × 41 × 61 × 103 × 137 × 151 × 241 × 307 × 331 × 409 × 953 × 1021 × 1321 × 1361 × 2143 × 2857 × 3061 × 4421 × 6529 × 8161 × 11119 × 12241 × 13669 × 26317 × 43691 × 51001 × 61681 × 106591 × 131071 × 354689 × 550801 × 949111 × 12717361 × 15571321 × 23650061 × 40932193 × 1326700741 × 2949879781 × 4562284561<10> × 611787251461<12> × 1392971637361<13> × 1467129352609<13> × 2879347902817<13> × 15455023589221<14> × 418562986357561<15> × 737539985835313<15> × 171664686650370481<18> × 7226904352843746841<19> × 9520972806333758431<19> × 26831423036065352611<20> × 51366149455494753931<20> × 1230412270786066204321<22> × 8088220746627020943841<22> × 5702451577639775545838643151<28> × 4251553088834471719044481725601<31> × 630894905395143528221826310327361<33> × 59759045572704532151734514229676903701763064698110618010245423428627221235639899045664816790870237783305610352947361<116> |