Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 341: | \[{4^{341}-1\over3}\] | 23 × 89 × 683 × 647219 × 1434929 × 715827883 × 2147483647 × 37368615235403<14> × 5560125493425335999<19> × 126901141805369975317583<24> × 1444211137344578755413561460184550803276100931567<49> × 88001338234326700695315986455482272586355782310144188047003818403<65> |