A130052 Numbers that are the sum of one or more consecutive squares in more than one way.

25, 365, 841, 1405, 1730, 2030, 3281, 3655, 3740, 4510, 4705, 4760, 4900, 5244, 5434, 5915, 5929, 7230, 7574, 8415, 8464, 9385, 11055, 11236, 11900, 12325, 12524, 14905, 16745, 17484, 18879, 19005, 19044, 19855, 20449, 20510, 21790, 22806, 23681

Offset: 1

Author

Paul Richards, May 03 2007

Keywords

• nonn

Examples

			25 = 3^2 + 4^2 = 5^2.
365 = 10^2 + 11^2 + 12^2 = 13^2 + 14^2.
		

Links

• Paul Richards and David W. Wilson, Table of n, a(n) for n = 1..10000 (first 135 terms from Paul Richards)

Crossrefs

Cf. A059255 (subsequence).

Programs

PARI

ok(n) = {my(i=sqrtint(n), m=0); while(i>0&&m<2, my(a=i^2, j=i); while(j>0&&a<=n, if(a==n, m+=1); j-=1; a=a+j^2); i-=1); return(m>1)}
{for(p=1, 24000, if(ok(p), print1(p,", ")))} \\ Antonio Roldán, Mar 09 2020

Extensions

Extended by Ray Chandler, May 04 2007