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

1,1

Links

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

Example

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

Prog

(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

Crossrefs

Cf. A059255 (subsequence).

Sequence in context: A197678 A197536 A045622 * A059255 A227024 A254376

Adjacent sequences: A130049 A130050 A130051 * A130053 A130054 A130055

Keyword

nonn

Author

Paul Richards, May 03 2007

Extensions

Extended by Ray Chandler, May 04 2007

Status

approved