Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 475: | \[{4^{475}-1\over3}\] | 11 × 31 × 191 × 251 × 601 × 1801 × 2281 × 4051 × 4751 × 174763 × 524287 × 18020551 × 420778751 × 30327152671<11> × 3011347479614249131<19> × 1369738735713888876695951<25> × 113709467433878120743807151<27> × 3145393391123750039342489201<28> × 23352531315412606928823082635851<32> × 170617159758027087771086981194610206694353113401<48> × 32972619777851117988625390165531124382269394491251<50> |