factoring 1000 semi primes in each case, product of prime1 and prime2

prime1 bits    prime2 bits    fails        time (s)

    5             5            148       0.003547
    5             10            12       0.005921
    5             15             0       0.006022
    5             20             0       0.026306
    5             25             0       0.006816
    5             30             0       0.010205
    5             35             0       0.012421
    5             40             0       0.013416
    10            10            30       0.012339
    10            15             4       0.015757
    10            20             0       0.017976
    10            25             0       0.027138
    10            30             0       0.031266
    10            35             0       0.027386
    10            40             0       0.028830
    15            15             2       0.046565
    15            20             1       0.096739
    15            25             0       0.098371
    15            30             0       0.099634
    15            35             0       0.100919
    15            40             0       0.102880
    20            20             2       0.318563
    20            25             0       0.449036
    20            30             0       0.470202
    20            35             0       0.487333
    20            40             0       0.454472
    25            25             0       1.584492
    25            30             0       2.469901
    25            35             0       2.526322
    25            40             0       4.979288
    30            30             0       9.291457
    30            35             0       25.555021
    30            40             0       27.536897
    35            35             0       106.396674
    35            40             0       151.659447
    40            40             0       607.335175