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 A144371 Shifts 7 places left under Dirichlet convolution. 2
 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 3, 2, 4, 2, 4, 5, 6, 6, 8, 8, 6, 10, 13, 12, 18, 16, 22, 14, 26, 26, 32, 37, 40, 48, 34, 52, 66, 64, 86, 86, 108, 70, 125, 132, 144, 180, 194, 216, 158, 250, 290, 300, 386, 388, 472, 317, 540, 592, 640, 772, 836, 950, 668, 1096, 1236, 1280 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,9 LINKS Alois P. Heinz, Table of n, a(n) for n = 1..1000 N. J. A. Sloane, Transforms FORMULA G.f.: x + x^2 + x^3 + x^4 + x^5 + x^6 + x^7 * (1 + Sum_{i>=1} Sum_{j>=1} a(i)*a(j)*x^(i*j)). - Ilya Gutkovskiy, May 09 2019 MAPLE k:= 7: 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..80); CROSSREFS 7th column of A144374. Cf. A000005. Sequence in context: A319353 A319343 A300827 * A323157 A333970 A338138 Adjacent sequences:  A144368 A144369 A144370 * A144372 A144373 A144374 KEYWORD eigen,nonn AUTHOR Alois P. Heinz, Sep 18 2008 STATUS approved

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Last modified April 11 23:58 EDT 2021. Contains 342909 sequences. (Running on oeis4.)