Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 254: | \[{20^{254}-1\over19}\] | 3 × 7 × 509 × 22861 × 206249 × 78732889 × 2824620209 × 312576217052731918639<21> × 57564425105062873850506481<26> × 9024329685219466934919221249<28> × 2042832095173841227635611678280020546809<40> × 657052369159196348354107943940109671040881828497963263263097769266629401<72> × 62368770429251821715505778874398353534071110029758004648111605459751162054686199377653947028251626418709594155079<113> |