# Computed 2018-07-29 in GP/PARI CALCULATOR Version 2.9.4 (released) amd64 running linux (x86-64/GMP-6.1.2 kernel) 64-bit version, compiled: Dec 19 2017, gcc version 7.3.0 (Ubuntu 7.3.0-1ubuntu1), threading engine: pthread # with the following program: # # A304819(n) = sumdiv(n,d,if(!ispower(d),(-1)^bigomega(d),0)); # A304820(n) = if(1==n,1,-sumdiv(n,d,if(d