Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 341: | \[2^{341}-1\] | 23 × 89 × 2147483647 × 5560125493425335999<19> × 126901141805369975317583<24> × 1444211137344578755413561460184550803276100931567<49> |