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A324830 Number of divisors d of n such that A323243(d) is a multiple of 3. 6
1, 1, 2, 1, 1, 3, 2, 1, 3, 1, 1, 4, 2, 3, 3, 2, 1, 4, 2, 1, 4, 2, 1, 5, 1, 3, 4, 4, 2, 4, 1, 2, 3, 1, 3, 5, 2, 3, 4, 1, 1, 6, 2, 2, 5, 1, 1, 7, 3, 1, 3, 4, 2, 6, 1, 5, 4, 3, 1, 5, 2, 2, 6, 2, 3, 6, 1, 1, 3, 5, 2, 7, 1, 3, 4, 4, 3, 6, 2, 2, 5, 1, 1, 8, 2, 3, 4, 3, 2, 7, 4, 1, 3, 2, 3, 8, 1, 5, 5, 2, 2, 5, 1, 5, 7 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..10000 (based on Hans Havermann's factorization of A156552)
FORMULA
a(n) = A000005(n) - (A324831(n) + A324832(n)).
For all n >= 1, a(A000040(n)) = 2-A000035(n).
PROG
(PARI) A324830(n) = sumdiv(n, d, (0==(A323243(d))%3));
CROSSREFS
Sequence in context: A345033 A329359 A235682 * A141110 A325758 A280073
KEYWORD
nonn
AUTHOR
Antti Karttunen, Mar 16 2019
STATUS
approved

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Last modified March 29 02:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)