Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 677: | \[{4^{677}-1\over3}\] | 2920579 × 6190489 × 1943118631 × 4643444189241244139<19> × 531132717139346021081<21> × 978146583988637765536217<24> × 569759973030889624117974624560195467<36> × 222155488792293038816414342324245378243<39> × 53625112691923843508117942311516428173021903300344567<53> × 11583306121194302925666610180475654822154587629577979400456857120235319057709961541850271218784399<98> × 19669923995361708852145993859707641107630702321001182971588684954093145685895575582513022784987779<98> |