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Worktodo.txt is the file that tellsPrime95 and other related programs whatwork units to do and specifically what other parameters to use for that particularassignments andworktype.

The list below shows the meaning of the various entries:

Lucas-Lehmer tests

• Test=assignment ID,exponent,how far factored,has beenP-1'ed
• DoubleCheck=assignment ID,exponent,how far factored,has been P-1'ed
• AdvancedTest=exponent

AdvancedTest simplyLL tests the givenMersenne number, (ignoring any sort of prefactoring) and is used byPrime95 when you use the Advanced > Test option.

Probable prime

• PRP=k,b,n,c[,how_far_factored,tests_saved][,known_factors]

Factoring

• Factor=assignment ID,exponent,how far factored,how far to factor to
• Pfactor=assignment ID,k,b (base),n (exponent),c,how far factored,LL tests saved if factor found
• Pminus1=assignment ID,k,b,n,c,B1,B2[,B2_start][,"factors"]
• ECM2=assignment ID,k,b,n,c,B1,B2,curves to do[,specific_sigma,B2_start][,"factors"]

where k, b, n, c represent a number k × bⁿ + c. (c can take negative values.)

In programs such asmmff andferomant, there is also

• FermatFactor=nmin,nmax,kmin,kmax

Starting from v25.5 of Prime95, worktodo.txt may also contain comment lines, which are ignored by the program.

See also

• Assignment ID

• Stub
• Great Internet Mersenne Prime Search