Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 265: | \[{21^{265}-1\over20}\] | 5 × 1697 × 40841 × 144161 × 207612155793974069<18> × 372515213872960388437<21> × 37303354528806477572029001<26> × 4555268603071594349347155493<28> × [18613516899845804011432611706821606120295063708016686112189498965251447632521240768482666721507696168464658521086707771536552206350990099889438611721949102579398895444951569744475846563916778138128148131919569635841189918115996475499563358187321<245>] |