Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 256: | \[{20^{256}-1\over19}\] | 3 × 7 × 17 × 97 × 193 × 257 × 401 × 577 × 641 × 36097 × 160001 × 1505882353 × 4213987444481<13> × 19781545588481<14> × 12818782843691777<17> × 6756288659793814433<19> × 82832842974154279534081<23> × 6016843417749425380073724334377601<34> × 26715523979628786958854098728207361<35> × 1824448644331953437805185594358681323803649<43> × 156839980152800728021646204730001269580086006946735576131204987806231126567668202731547125644464093953<102> |