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A023825 Sum of exponents in prime-power factorization of C(3n,n+3). 1
2, 4, 6, 5, 6, 7, 9, 9, 10, 12, 13, 11, 12, 11, 14, 14, 13, 15, 16, 14, 18, 18, 18, 18, 18, 20, 22, 17, 18, 20, 23, 21, 20, 22, 23, 21, 23, 23, 26, 25, 23, 28, 29, 28, 29, 27, 30, 30, 30, 28, 30, 27, 31, 33, 34, 33, 33, 36, 35, 31, 31, 33, 37, 35, 33, 34, 35, 31, 36, 36, 37, 36, 35, 38, 40, 37, 35, 35 (list; graph; refs; listen; history; text; internal format)
OFFSET
2,1
LINKS
MATHEMATICA
Table[Total[FactorInteger[Binomial[3 n, n + 3]][[All, 2]]], {n, 2, 79}] (* Ivan Neretin, Nov 02 2017 *)
CROSSREFS
Sequence in context: A063892 A353650 A254763 * A022485 A230631 A271324
KEYWORD
nonn
AUTHOR
EXTENSIONS
a(2)=2 added and offset corrected to 2 by Ivan Neretin, Nov 02 2017
STATUS
approved

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Last modified August 30 00:57 EDT 2024. Contains 375520 sequences. (Running on oeis4.)