Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 216: | \[{31^{216}-1\over30}\] | 27 × 33 × 72 × 13 × 19 × 37 × 73 × 109 × 163 × 331 × 409 × 541 × 577 × 1129 × 3637 × 6427 × 81343 × 922561 × 1536553 × 1538083 × 4683817 × 18880993 × 599329963 × 12733754041<11> × 512616735577<12> × 852890113921<12> × 1836205027201<13> × 126901881805771<15> × 277477787226853<15> × 91556360840213317<17> × 19235533383829731610441<23> × 1814503763676130449408979921<28> × 42926963506416779294438166608743110611361841<44> × 436873125732048707009804398817318579014429218712935001<54> |