

A165893


Numbers n with property that n(n+2)(n+4) is a triangular number.


2




OFFSET

1,3


COMMENTS

Abscissas of integral points on the elliptic curve: m^2 = 8*n^3 + 48*n^2 + 64*n + 1.


LINKS



MATHEMATICA

TNQ[n_]:=IntegerQ[Sqrt[1+8n]]; Select[Range[7500], TNQ[ #(#+2)(#+4)]&]


CROSSREFS

Cf. A001219 Triangular numbers of form a(a+1)(a+2), A165892 Triangular numbers of form a(a+2)(a+4).


KEYWORD

nonn,fini,full


AUTHOR



EXTENSIONS

Initial 0 added by Zak Seidov, Oct 04 2009 at the suggestion of Alexander R. Povolotsky.


STATUS

approved



