Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 240: | \[{31^{240}-1\over30}\] | 28 × 3 × 5 × 72 × 11 × 13 × 17 × 19 × 37 × 41 × 61 × 97 × 181 × 241 × 331 × 409 × 1129 × 2521 × 17351 × 21821 × 25621 × 35401 × 922561 × 1529401 × 1546081 × 32360641 × 327412201 × 4707206941<10> × 25085030513<11> × 136046551681<12> × 304643210761<12> × 362634922081<12> × 852890113921<12> × 880374069121<12> × 69916284426778163281<20> × 7499207440683838894753<22> × 727422334085254365392641<24> × 864542404017920606719201<24> × 1637872091108040680148042294721<31> × 3889436310686727916228493162492361601<37> × 9667783133425605119410155998541192601<37> |