OFFSET

1,2

COMMENTS

By Kummer's theorem, a(n) is the sum over all primes p of the number of carries when n+4 is added to 4n-4 in base p. - Robert Israel, Nov 09 2017

LINKS

Ivan Neretin, Table of n, a(n) for n = 1..10000

Wikipedia, Kummer's theorem

MAPLE

seq(numtheory:-bigomega(binomial(5*n, n+4)), n=1..100); # Robert Israel, Nov 09 2017

MATHEMATICA

Table[PrimeOmega[Binomial[5 n, n + 4]], {n, 77}] (* Ivan Neretin, Nov 09 2017 *)

PROG

(PARI) a(n) = a(n) = bigomega(binomial(5*n, n+4)); \\ Michel Marcus, Nov 09 2017

CROSSREFS

KEYWORD

nonn

AUTHOR

STATUS

approved