OFFSET
1,2
COMMENTS
When sorted, this is A081756. - N. J. A. Sloane, May 03 2019
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..730
EXAMPLE
For n = 3; a(3) = sigma(A007691(3)) = sigma(28) = 56.
PROG
(Magma) [SumOfDivisors(n): n in [1..1000000] | IsIntegral(SumOfDivisors(n)/n)]
(PARI) lista(nn) = {for (n=1, nn, my(s=sigma(n)); if (! (s % n), print1(s, ", ")); ); } \\ Michel Marcus, Apr 26 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Apr 26 2019
STATUS
approved