OFFSET
1,2
COMMENTS
Numbers not divisible by at least one of 5, 13, 21, ...
LINKS
Jianing Song, Table of n, a(n) for n = 1..10000
EXAMPLE
9 is a term since it has no divisor congruent to 5 modulo 8.
PROG
(PARI) res(n, a, b) = sumdiv(n, d, (d%a) == b)
isA343109(n) = (res(n, 8, 5) == 0)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Jianing Song, Apr 05 2021
STATUS
approved