OFFSET
1,2
LINKS
FORMULA
PROG
(PARI) for(n=1, 150, print1(sum(i=1, 10*n, if((sigma(n))%(sigma(i)), 0, 1)), ", "))
(PARI) A070610(n) = { my(s=sigma(n)); sum(k=1, s, !(s%sigma(k))); }; \\ Antti Karttunen, Nov 17 2017
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Benoit Cloitre, May 13 2002
EXTENSIONS
Offset corrected, name edited by Antti Karttunen, Nov 17 2017
STATUS
approved