experimental-projects/oeis-research/Wesley Ivan Hurt/Sum of the divisors of sigma_n(n)/prog.sf

#!/usr/bin/ruby

# a(n) = Sum of the divisors of sigma_n(n).
# https://oeis.org/A347718

include("../../../factordb/auto.sf")

func a(n) {
    sigma(sigma(n, n))
}

for n in (1..1000) {
    #print(a(n), ", ")
    say "#{n} #{a(n)}"
}

__END__

# PARI/GP program:

a(n) = sigma(sigma(n, n));