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A227833 3-adic valuation of A005130(n). 2
0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 2, 3, 5, 5, 3, 2, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 2, 3, 5, 6, 6, 7, 8, 9, 11, 13, 15, 18, 18, 15, 13, 11, 9, 8, 7, 6, 6, 5, 3, 2, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 2, 3, 5, 5, 3, 2, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 2, 3, 5, 6, 6, 7, 8, 9, 11, 13, 15, 18, 19, 18, 18, 18, 18, 19 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,12

COMMENTS

3^a(n) is the highest power of 3 dividing A005130(n).

LINKS

Table of n, a(n) for n=0..100.

PROG

(MAGMA) A005130:=func<i | IsZero(i) select 1 else &*[Factorial(3*k+1)/Factorial(i+k): k in [0..i-1]]>; [Valuation(A005130(n), 3): n in [0..100]]; // Bruno Berselli, Aug 05 2013

CROSSREFS

Cf. A005130, A194827, A007949.

Sequence in context: A082876 A096099 A019780 * A133293 A262565 A096289

Adjacent sequences:  A227830 A227831 A227832 * A227834 A227835 A227836

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Aug 04 2013, based on a suggestion from Victor H. Moll.

STATUS

approved

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Last modified November 13 01:32 EST 2018. Contains 317118 sequences. (Running on oeis4.)