Base 13 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 355: | \[{13^{355}-1\over12}\] | 2131 × 6959 × 12923 × 30941 × 201499 × 260703481 × 61498306226332924441<20> × 87623942286640326849311<23> × 56573583882629131201397586942443243853379490390398336588076200421<65> × [247264339160763304014448098901656756965051631407879619707297853790396112483413243284892259930092140523056679158982166120998248098512097273637358610228522946916774520676182141710941096467736158396652592756032772078359754298581285701992318432937111449656000421<258>] |