Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
649: | \[2^{649}-1\] | 23 × 89 × 179951 × 649001 × 23952086159<11> × 3203431780337<13> × 34418203155300430111979265857<29> × 3700008265010484376181140059002735164665618094577260273009727474953442430219036282100642597609582698411614761090487936159280023273<130> |