A025308 - OEIS

A025308

Numbers that are the sum of 2 distinct nonzero squares in exactly 7 ways.

105625, 180625, 203125, 211250, 265625, 361250, 406250, 422500, 453125, 525625, 531250, 578125, 640625, 714025, 722500, 812500, 828125, 845000, 855625, 906250, 950625, 953125, 1050625, 1051250, 1062500, 1140625, 1156250, 1281250, 1390625

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OFFSET

1,1

LINKS

Donovan Johnson, Table of n, a(n) for n = 1..1000

Index entries for sequences related to sums of squares

MATHEMATICA

nn = 1390625; t = Table[0, {nn}]; lim = Floor[Sqrt[nn - 1]]; Do[num = i^2 + j^2; If[num <= nn, t[[num]]++], {i, lim}, {j, i - 1}]; Flatten[Position[t, 7]] (* T. D. Noe, Apr 07 2011 *)

CROSSREFS

Sequence in context: A203822 A013889 A353553 * A025290 A242479 A252775

Adjacent sequences: A025305 A025306 A025307 * A025309 A025310 A025311

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved