OFFSET
1,2
COMMENTS
Numbers k such that k | A073355(k).
LINKS
EXAMPLE
3 is a term because the first 3 terms of A007947 are 1, 2 and 3 whose sum is divisible by 3.
PROG
(PARI) isok(k) = sum(i=1, k, factorback(factor(i)[, 1])) % k == 0; \\ Michel Marcus, Apr 25 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Apr 24 2018
EXTENSIONS
a(13)-a(17) from Alois P. Heinz, Apr 24 2018
a(18)-a(26) from Daniel Suteu, Apr 24 2018
a(27)-a(32) from Giovanni Resta, Apr 26 2018
STATUS
approved