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 2015-10-09, 12:32 #4 science_man_88     "Forget I exist" Jul 2009 Dumbassville 26·131 Posts you can make your Pari code even simpler other than to knock out the remaining multiples of five you can do: Code: forstep(x=1,10000,6,...) or: Code: parfor(x=1,10000,...;if(x%5!=4,...)) for example. because all the indexes that aren't even and don't divide by 3 are of form 6y+1 and then you can show they are 1,7,13,19,25 mod 30 and 25 mod 30 can always be taken away for the index because it will always end in 5.