Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 513: | \[{31^{513}-1\over30}\] | 33 × 331 × 571 × 2053 × 3637 × 7639 × 14251 × 81343 × 49267837 × 1836205027201<13> × 36068660903683<14> × 126901881805771<15> × 2104977965218759<16> × 88770666332610762169<20> × 153684680768158196616662431<27> × 1716439847900062900800798410166938893<37> × 2368562559008917184473315386430964446049509799210734488365584887775209479876236065043940219937663830684002061294348835674729152634690712733979130739155733<154> × [2392884406410431445594000972149569810725858899920486747554613493823649677723834243263405801018162718928428321798234078641224033158163011859637909596307088715062853214470000342384509169471975378340424011355749381325198515111807579778956233002776508945165883746583382064400949836839091800980810473987718184005998676409659691287449153760898895919552591840001038162846453505186562561070481461426146623401663772447880525786344982416537796767253<439>] |