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A023821 Sum of exponents in prime-power factorization of C(3n,n-2). 0
0, 2, 3, 3, 6, 5, 6, 8, 8, 9, 11, 9, 10, 10, 12, 11, 12, 13, 13, 14, 17, 15, 17, 17, 16, 18, 19, 17, 20, 17, 19, 21, 19, 19, 22, 20, 20, 21, 22, 21, 23, 26, 26, 28, 29, 25, 29, 28, 27, 28, 29, 26, 32, 31, 31, 32, 30, 31, 33, 33, 31, 31, 35, 33, 32, 30, 31, 32, 36, 32, 35, 34, 33, 38, 37, 35, 38, 35 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

LINKS

Table of n, a(n) for n=2..79.

MATHEMATICA

Join[{0}, Table[Total[Transpose[FactorInteger[Binomial[3n, n-2]]][[2]]], {n, 3, 80}]] (* Harvey P. Dale, Sep 23 2014 *)

CROSSREFS

Sequence in context: A119322 A014498 A186286 * A187754 A075258 A212629

Adjacent sequences:  A023818 A023819 A023820 * A023822 A023823 A023824

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified August 28 22:18 EDT 2015. Contains 261164 sequences.