Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
156: | \[{5^{156}-1\over4}\] | 22 × 32 × 7 × 132 × 31 × 53 × 79 × 157 × 601 × 3121 × 5227 × 38923 × 8684521 × 305175781 × 4056854881 × 22735632934561<14> × 83181652304609<14> × 608459012088799<15> × 667929705480493<15> |