Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 153: | \[{31^{153}-1\over30}\] | 32 × 331 × 3637 × 17137 × 81343 × 1961163283 × 42834601810502407<17> × 751670559138758105956097<24> × 261116663697161542351918133573442849307<39> × 201826644114768002063745646190803184405042892728052180172416358859250340467495216313254851591891887712483636096433056488999<123> |