Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 301: | \[{4^{301}-1\over3}\] | 432 × 127 × 431 × 9719 × 490631 × 2099863 × 2932031007403<13> × 365505823711978039310711<24> × 20336952491372732458100553842885784919705927999<47> × 250496677636134194455624482113419891241717626649461375803326671768162580233<75> |