Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet ECM Progress

ECM on Fermat numbers

Digits in factor 25 30 35 40 45 50 55 60 65
Bound #1 50,000 250,000 1,000,000 3,000,000 11,000,000 44,000,000 110,000,000 260,000,000 800,000,000
Curves to test 280 640 1,580 4,700 9,700 17,100 46,500 112,000 360,000
4096 Done Done Done Done Done Done Done Done 93,181
8192 Done Done Done Done Done Done Done Done 52,714
16384 Done Done Done Done Done Done Done Done 329,085
32768 Done Done Done Done Done Done Done Done 145,435
65536 Done Done Done Done Done Done Done 19,695
131072 Done Done Done Done Done Done Done 38,485
262144 Done Done Done Done Done Done 19,982
524288 Done Done Done Done Done 8,251
1048576 Done Done Done Done Done 4,823
2097152 Done Done Done Done 8,124
4194304 Done Done Done Done 2,765
8388608 Done Done Done Done 1,324
16777216 Done Done Done 2,951
33554432 Done Done Done 723
67108864 Done Done 842
134217728 Done 346
268435456 Done 89
536870912 47

ECM on Mersenne numbers with no known factors

Exponent range:
 
Digits in factor 25 30 35 40 45 50 55 60 65
Bound #1 50,000 250,000 1,000,000 3,000,000 11,000,000 44,000,000 110,000,000 260,000,000 800,000,000
Curves to test 280 640 1,580 4,700 9,700 17,100 46,500 112,000 360,000
1277 Done Done Done Done Done Done Done Done Done
1619 Done Done Done Done Done Done Done Done 157,731
1753 Done Done Done Done Done Done Done Done 122,615
2267 Done Done Done Done Done Done Done Done 67,358
2273 Done Done Done Done Done Done Done Done Done
2423 Done Done Done Done Done Done Done Done Done

ECM on Mersenne numbers with known factors

Exponent range:
 
Digits in factor 25 30 35 40 45 50 55 60 65
Bound #1 50,000 250,000 1,000,000 3,000,000 11,000,000 44,000,000 110,000,000 260,000,000 800,000,000
Curves to test 280 640 1,580 4,700 9,700 17,100 46,500 112,000 360,000