OFFSET
1,4
COMMENTS
Except for the first 2 terms, all terms are odd.
LINKS
Michel Marcus, Table of n, a(n) for n = 1..5000
PROG
(PARI) lista(nn) = {for (n=1, nn, if (issquare(n) || (!(n%2) && issquare(n/2)), print1(sigma(n) % eulerphi(n), ", "); ); ); }
CROSSREFS
KEYWORD
nonn
AUTHOR
Michel Marcus, Apr 08 2020
STATUS
approved