OFFSET
1,1
COMMENTS
Also numbers k such that denominator(sigma(k)/k) = 5. - David A. Corneth, Oct 15 2023
LINKS
David A. Corneth, Table of n, a(n) for n = 1..166 (first 61 terms from Jud McCranie, terms <= 10^28)
EXAMPLE
30 is in the sequence as gcd(sigma(30), 30) = gcd(72, 30) = 6 = 30/5. - David A. Corneth, Oct 15 2023
PROG
(PARI) is(n) = gcd(sigma(n), n) == n/5 - David A. Corneth, Oct 15 2023
CROSSREFS
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Feb 20 2002
EXTENSIONS
More terms from Sam Handler (sam_5_5_5_0(AT)yahoo.com), Nov 15 2004
STATUS
approved