[QUOTE=unconnected;484667]This is exactly what you want. From docfile:

[code]-pretest [num] Use this switch with factor() for ECM pretesting of the input number.
Optionally provide an integer value specifing the maximum level of
pretesting to do (up to "num" digits, or a t-level of "num")

[/code]I use it this way to crack some composite numbers in automatic mode.
[CODE]./yafu "factor(@)" -threads 8 -batchfile list -pretest 25 -of out.txt[/CODE][/QUOTE]

But using -pretest with factor() will still factor the number. This is not what we want at yafu@home. If the composite is above the limit for this type of computer there should be no nfs stage only ecm even if that fails to factor the number.

Reserving 1758312

Taking 173460 324072

Drop 1630704 (2^3*3, ECMed C116)
Drop 1546272 (2^4*3, ECMed C113)
Drop 1785088 (2*3, ECMed C116)
Drop 1424760 (2^2*7, ECMed C115)
Drop 1697584 (2^2*3*7*ECMed C115)
Drop 1918080 (2^4*3*5*ECMed C123)
Drop 559368 (2^5*5, C141 cofactor with 4000@3e6 ECM)
Drop 868704 (2^4*3, C146 cofactor with 4000@3e6 ECM)

Take 1596564 1692396

Taking 1932360

Drop 1509198 1513848 1417668 1759368 1756584 1649550 1627548 1503642 1445340 1466496

Update 1627344 1857192 1594044 1423848

Taking 357280 832518 405420 1970220

[QUOTE=ChristianB;484702]But using -pretest with factor() will still factor the number. This is not what we want at yafu@home. If the composite is above the limit for this type of computer there should be no nfs stage only ecm even if that fails to factor the number.[/QUOTE]
Did you try the command? Create a text file, say call it rsa120.num, and paste the RSA120 number inside, don't forget to add cr/lf (my version of yafu still skips the last line in the text if there is no cr/lf after it!), save it in the current folder where yafu is,

[CODE]227010481295437363334259960947493668895875336466084780038173258247009162675779735389791151574049166747880487470296548479

[/CODE]
then call:


[CODE]yafu factor(@) -v -batchfile rsa120.num -pretest[/CODE](note that the number is not needed, and the values in yafu.ini will be used)

Taking 1979692.