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A023854
Sum of exponents in prime-power factorization of binomial(6n, 3n).
11
3, 5, 6, 7, 11, 11, 12, 13, 14, 15, 16, 15, 19, 20, 21, 22, 23, 23, 22, 25, 29, 25, 29, 28, 31, 32, 30, 31, 34, 34, 35, 35, 36, 36, 38, 38, 41, 41, 41, 40, 46, 44, 43, 44, 44, 46, 47, 46, 47, 50, 51, 49, 53, 49, 52, 53, 53, 56, 55, 56, 60, 60, 61, 57, 61, 61, 61, 65, 66, 63, 67, 66, 69, 69, 66, 69, 71, 70, 72, 72
OFFSET
1,1
LINKS
MATHEMATICA
Total[Transpose[FactorInteger[Binomial[6 #, 3 #]]][[2]]]&/@Range[80] (* Harvey P. Dale, May 14 2011 *)
CROSSREFS
Sequence in context: A335911 A136804 A129802 * A324511 A360008 A092559
KEYWORD
nonn
EXTENSIONS
Corrected and extended by Harvey P. Dale, May 14 2011
STATUS
approved