A180273 Squares which are a sum of consecutive squares starting with 7^2.

49, 8464, 20449, 60025, 2304324, 3624882849

Offset: 1

Author

Zhining Yang, Jan 17 2011

Keywords

• nonn
• easy
• fini
• full

Comments

That is, terms are squares of the form sum_{i=7..m} i^2 for some m. This sequence is complete. See A180442 and A184763.

Examples

			a(2) = 8464 = 92^2 = 7^2+8^2+9^2+...+28^2+29^2.
		

Crossrefs

Cf. A001032, A094196, A151557, A180259.

Programs

Mathematica

Select[Accumulate[Range[7,3000]^2],IntegerQ[Sqrt[#]]&] (* Harvey P. Dale, Jul 16 2014 *)

PARI

for(n=8,9999999,t=n*(n+1)*(2*n+1)/6-91;if(issquare(t),print1(t,",")))