Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 490: | \[{4^{490}-1\over3}\] | 52 × 11 × 29 × 31 × 41 × 43 × 71 × 113 × 127 × 197 × 281 × 491 × 1471 × 86171 × 122921 × 7416361 × 47392381 × 7439220181<10> × 19707683773<11> × 4363953127297<13> × 4432676798593<13> × 4981857697937<13> × 306178659371201<15> × 1372226516822701<16> × 15162868758218274451<20> × 1008787906424294727221<22> × 50647282035796125885000330641<29> × 44399394252774652151567131602624448846381<41> × 252359902034571016856214298851708529738525821631<48> |