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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 22 10:57 EDT 2018. Contains 316437 sequences. (Running on oeis4.)