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Gordon 2015-11-22 15:59

Accidentally factored
 
While running a fresh set of curves through gmp-ecm, I set the haswell to running ecm (advanced, ecm) on an exponent in the 250k range, I meant to type in 255251, instead I mis-typed 255521.

Found 3 factors

127

1615926072477214583301236874001 - 100.35 bits

113251268558694037995013049810661462891857455223 - 156.30 bits

Stargate38 2015-11-22 16:17

1615926072477214583301236874001=127*2423*8863*15193*35449*730753*1505447
113251268558694037995013049810661462891857455223=127*2423*8863*15193*35449*730753*1505447*70084436712553223

Some of those prime factors come from algebraic factors (M7, M173, M211, M1211, M1477, and M36503).


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