A023825 Sum of exponents in prime-power factorization of C(3n,n+3).

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

Offset

2,1

Links

Ivan Neretin, Table of n, a(n) for n = 2..10000

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

Adjacent sequences: A023822 A023823 A023824 * A023826 A023827 A023828

Keyword

nonn

Author

Clark Kimberling

Extensions

a(2)=2 added and offset corrected to 2 by Ivan Neretin, Nov 02 2017

Status

approved