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Search: id:A140612
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| A140612 |
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Positive integers n such that both n and n+1 are the sum of 2 squares. |
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+0
2
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| 1, 4, 8, 9, 16, 17, 25, 36, 40, 49, 52, 64, 72, 73, 80, 81, 89, 97, 100, 116, 121, 136, 144, 145, 148, 169, 180, 193, 196, 225, 232, 233, 241, 244, 256, 260, 288, 289, 292, 305, 313, 324, 337, 360, 361, 369, 388, 400, 404, 409, 424, 441, 449, 457
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Equivalently, positive n such that n(n+1) is the sum of two squares.
Trivially, sequence includes all positive squares.
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EXAMPLE
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40 = 6^2 + 2^2, 41 = 5^2 + 4^2, so 40 is in the sequence.
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CROSSREFS
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Cf. A050795 (2a(n)+1), A001481, A002378, A000290.
Sequence in context: A072103 A004756 A106840 this_sequence A034023 A086368 A034024
Adjacent sequences: A140609 A140610 A140611 this_sequence A140613 A140614 A140615
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KEYWORD
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easy,nonn
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AUTHOR
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Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), May 19 2008
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