# Computed 2017-10-20 in GP/PARI CALCULATOR Version 2.9.2 (released) amd64 running mingw (x86-64/GMP-6.1.2 kernel) 64-bit version, compiled: Mar 22 2017, gcc version 4.9.1 (GCC), threading engine: single # with the following PARI-program: # # A005171(n) = !isprime(n); # A050374(n) = if(1==n,n,sumdiv(n,d,if(d