Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 897: | \[2^{897}-1\] | 7 × 47 × 79 × 599 × 8191 × 121369 × 178481 × 9341359 × 14718679249<11> × 10052678938039<14> × 13444476836590589479<20> × 51441563151591093599<20> × 260242449712509916159<21> × 1537526783273536776150319235903170205959819485321159180650397325688028293946582263261957598097436550149727758914860073386697409601201694581574168811926672318471<160> |