Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 337: | \[2^{337}-1\] | 18199 × 2806537 × 95763203297<11> × 726584894969<12> × 78778047326466742993612420842416198311394008068822475527239136925369<68> |