Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 670: | \[2^{670}-1\] | 3 × 11 × 31 × 93131 × 464311 × 7327657 × 193707721 × 1532217641 × 761838257287<12> × 6713103182899<13> × 21505409328405921060057783156144213618485460844911284448661782641<65> × 462968972850605487726216422914611666280373111850525667327093865346827818121<75> |