Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 512: | \[{4^{512}-1\over3}\] | 5 × 17 × 257 × 641 × 65537 × 274177 × 2424833 × 6700417 × 67280421310721<14> × 1238926361552897<16> × 59649589127497217<17> × 5704689200685129054721<22> × 7455602825647884208337395736200454918783366342657<49> × 93461639715357977769163558199606896584051237541638188580280321<62> × 741640062627530801524787141901937474059940781097519023905821316144415759504705008092818711693940737<99> |