Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 461: | \[{4^{461}-1\over3}\] | 2767 × 99577 × 110641 × 4776428166707<13> × 108902775905377<15> × 358228856441770927<18> × 7099353734763245383<19> × 1017228587161022218598932642491638987<37> × 340463734626779075359487007554818745945247112614613829537926067651<66> × 846134609236527432935428641453947808692744612842997575850108349114305165850593069285923876628410633<99> |