OFFSET
1,6
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..16384
FORMULA
PROG
(PARI) for(n=1, 150, print1(sum(i=1, 10*n, if(sigma(n)-sigma(i), 0, 1)), ", "))
(PARI) A070242(n) = { my(s=sigma(n)); length(select(i->sigma(i) == s, vector(s, i, i))); } \\ Antti Karttunen, Nov 07 2017
(PARI) A070242(n) = { my(s=sigma(n)); sum(k=1, s, (sigma(k)==s)); }; \\ Antti Karttunen, Nov 07 2017
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Benoit Cloitre, May 09 2002
STATUS
approved