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A343108
Numbers having no divisor of the form 8*k + 3.
8
1, 2, 4, 5, 7, 8, 10, 13, 14, 16, 17, 20, 23, 25, 26, 28, 29, 31, 32, 34, 37, 40, 41, 46, 47, 49, 50, 52, 53, 56, 58, 61, 62, 64, 65, 68, 71, 73, 74, 79, 80, 82, 85, 89, 92, 94, 97, 98, 100, 101, 103, 104, 106, 109, 112, 113, 116, 119, 122, 124, 125, 127, 128
OFFSET
1,2
COMMENTS
Numbers not divisible by at least one of 3, 11, 19, ...
LINKS
EXAMPLE
7 is a term since it has no divisor congruent to 3 modulo 8.
PROG
(PARI) res(n, a, b) = sumdiv(n, d, (d%a) == b)
isA343108(n) = (res(n, 8, 3) == 0)
CROSSREFS
Numbers having m divisors of the form 8*k + i: A343107 (m=1, i=1), this sequence (m=0, i=3), A343109 (m=0, i=5), A343110 (m=0, i=7), A343111 (m=2, i=1), A343112 (m=1, i=3), A343113 (m=1, i=5), A141164 (m=1, i=7).
Indices of 0 in A188170.
Sequence in context: A192817 A229968 A190853 * A245029 A027902 A067076
KEYWORD
nonn,easy
AUTHOR
Jianing Song, Apr 05 2021
STATUS
approved