A175410 a(n) = (b(m)-1)*b(m) = Sum_{n=b(m)+1,...,c(m)}n, b=A046174, c=A046175, m=n+1.

132, 27060, 5269320, 1022496552, 198362899020, 38481433358940, 7465200453136272, 1448210416843244880, 280945355811546307860, 54501950819034511436292, 10573097513564898455783640

Offset: 1

Author

Manuel Valdivia, May 05 2010

Keywords

• nonn

Comments

Solution to (b-1)*b = (c^2+2bc+c)/2.

Examples

			A046174(2) = 12, then 11*12 = 13+14+15+16+17+18+19+20 = 132, is a term. A046174(3) = 165, then 164*165 = 166+167+,....,+285 = 27060, is a term.
		

Crossrefs

A046174, A046175.

Programs

Mathematica

lst={};k=1;j=0;Do[b=14*k-j-2;AppendTo[lst,(b-1)*b];j=k;k=b,{n,1,16}];lst