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A278478 a(n) is the 2-adic valuation of A000041(n). 8
0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 1, 3, 0, 0, 0, 4, 0, 0, 0, 1, 0, 3, 1, 0, 0, 1, 2, 1, 1, 0, 2, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 2, 0, 1, 2, 2, 0, 0, 2, 0, 1, 1, 6, 0, 0, 0, 5, 0, 0, 0, 2, 3, 0, 0, 2, 1, 2, 0, 0, 0, 2, 0, 1, 0, 0, 0, 0, 0, 0, 0, 3, 0, 11, 1, 3, 0, 2, 1, 0, 1, 0, 0, 4, 0, 2, 7, 1, 0, 2, 2, 0, 0, 3, 2, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,12

COMMENTS

Write A000041(n) = 2^k * s where s is odd, then a(n) = k.

LINKS

Joerg Arndt, Table of n, a(n) for n = 0..10000

MAPLE

a:= n-> padic[ordp](combinat[numbpart](n), 2):

seq(a(n), n=0..120);  # Alois P. Heinz, Nov 23 2016

PROG

(PARI) { my( x='x+O('x^100), v=Vec(1/eta(x)) ); vector(#v, n, valuation(v[n], 2)) }

CROSSREFS

Cf. A278479.

Cf. A052002, A237280, A278779, A278780, A278781, A278782, A278783, A278784 (positions of terms 0, 1, 2, ..., 7 in this sequence).

Cf. also A278241.

Sequence in context: A151671 A267502 A296605 * A122480 A096133 A293381

Adjacent sequences:  A278475 A278476 A278477 * A278479 A278480 A278481

KEYWORD

nonn

AUTHOR

Joerg Arndt, Nov 23 2016

STATUS

approved

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Last modified October 23 01:24 EDT 2018. Contains 316518 sequences. (Running on oeis4.)