Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 370: | \[{21^{370}-1\over20}\] | 2 × 5 × 11 × 12211 × 31081 × 40841 × 185641 × 1681762703 × 36955800911<11> × 10738834628461552327151<23> × 805835118294704523571872311<27> × 7995105693353508392600118377453099<34> × 379919184478057330357419845346252603881265273961<48> × 33065324202212642549310012954496185742918233451493473181<56> × 1761874971188605848411736999084615673686345216348914237217352072481351388225968707835525258166069573967120111124555520441<121> × 2761759803910063342109452450796117239047734185634311505245768046477780798015602520109978435231997220399829212738318616214647006920765874830281<142> |