Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
137: | \[{20^{137}-1\over19}\] | 1139265971 × 519124739914239138234099991<27> × 1550454239729214125594858269650609108408627458001480597404916790220082810453152846327131756809045902891421380387919201304423524421879627196561<142> |