Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 434: | \[{4^{434}-1\over3}\] | 5 × 29 × 43 × 113 × 127 × 5209 × 5581 × 8681 × 31249 × 49477 × 62497 × 384773 × 16233337 × 715827883 × 2147483647 × 6268703933840364033151<22> × 378428804431424484082633<24> × 776729668507005203702993<24> × 139335546032913681584758997<27> × 140508608590164280225934233098866842745808905947<48> × 867988564747274927163124868127898657976489313137639569<54> |