3,1

Cf. A000292 Tetrahedral (or pyramidal) numbers: C(n+2,3) = n(n+1)(n+2)/6.

Table of n, a(n) for n=3..75.

a(n)=gpf(n(n+1)(n+2)/6), n=3,4,...

FactorInteger[#][[-1, 1]]&/@Binomial[Range[2, 80]+2, 3] (* Harvey P. Dale, Jan 31 2013 *)

Cf. A000292.

Sequence in context: A197695 A245083 A233565 * A082087 A263317 A256300

Adjacent sequences: A121356 A121357 A121358 * A121360 A121361 A121362

nonn

Zak Seidov, Sep 06 2006

approved