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Search: id:A007692
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| A007692 |
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Numbers that are the sum of 2 nonzero squares in 2 or more ways.
(Formerly M5299)
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+0
3
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| 50, 65, 85, 125, 130, 145, 170, 185, 200, 205, 221, 250, 260, 265, 290, 305, 325, 338, 340, 365, 370, 377, 410, 425, 442, 445, 450, 481, 485, 493, 500, 505, 520, 530, 533, 545, 565, 578, 580, 585, 610, 625, 629, 650, 680, 685, 689, 697, 725, 730, 740, 745, 754, 765
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
D. Wells, The Penguin Dictionary of Curious and Interesting Numbers. Penguin Books, NY, 1986, 125.
Ming-Sun Li, Kathryn Robertson, Thomas J. Osler, Abdul Hassen, Christopher S. Simons and Marcus Wright, "On numbers equal to the sum of two squares in more than one way", Mathematics and Computer Education, 43 (2009), 102 - 108. [From Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Jul 27 2009]
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LINKS
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Index entries for sequences related to sums of squares
D. J. C. Mackay and S. Mahajan, Numbers that are Sums of Squares in Several Ways
AskNRICH Archive, Numbers expressible as the sum of 2 squares in more than one way
G. Xiao, Two squares
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CROSSREFS
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Subsequence of A001481.
Sequence in context: A062118 A167329 A109552 this_sequence A025285 A092541 A102803
Adjacent sequences: A007689 A007690 A007691 this_sequence A007693 A007694 A007695
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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