Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 407: | \[{8^{407}-1\over7}\] | 23 × 89 × 223 × 3257 × 9769 × 321679 × 564103 × 599479 × 3357751 × 10832713 × 26295457 × 319020217 × 616318177 × 3068001817 × 5083469670561297247<19> × 1826375940722234754636475033<28> × 64374964789425759023795123420605218308370931223311543823123770088423<68> × 9468219926376610351814630667055791258927241579222865577983532752324517780609767507897909170281482115409756566262338855699794413125837039166040422263601623990310256781862303273<175> |