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A144369
Shifts 5 places left under Dirichlet convolution.
2
1, 1, 1, 1, 1, 1, 2, 2, 3, 2, 4, 4, 6, 7, 6, 8, 12, 12, 18, 14, 21, 24, 32, 36, 34, 46, 56, 64, 86, 69, 104, 118, 146, 172, 156, 208, 256, 300, 368, 316, 455, 512, 636, 748, 668, 910, 1084, 1272, 1552, 1354, 1884, 2168, 2644, 3108, 2780, 3792, 4440, 5288, 6358, 5568
OFFSET
1,7
LINKS
N. J. A. Sloane, Transforms
FORMULA
G.f.: x + x^2 + x^3 + x^4 + x^5 * (1 + Sum_{i>=1} Sum_{j>=1} a(i)*a(j)*x^(i*j)). - Ilya Gutkovskiy, May 09 2019
MAPLE
k:= 5: with (numtheory): dck:= proc(b, c) proc(n, k) option remember; add (b(d, k) *c(n/d, k), d=`if`(n<0, {}, divisors(n))) end end: B:= dck(T, T): T:= (n, k)-> if n<=k then 1 else B(n-k, k) fi: a:= n-> T(n, k): seq (a(n), n=1..60);
CROSSREFS
5th column of A144374. Cf. A000005.
Sequence in context: A184198 A238998 A355359 * A033822 A368315 A144428
KEYWORD
eigen,nonn
AUTHOR
Alois P. Heinz, Sep 18 2008
STATUS
approved