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Search: id:A002479
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| A002479 |
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Numbers of form x^2 + 2y^2.
(Formerly M0547 N0197)
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+0
2
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| 0, 1, 2, 3, 4, 6, 8, 9, 11, 12, 16, 17, 18, 19, 22, 24, 25, 27, 32, 33, 34, 36, 38, 41, 43, 44, 48, 49, 50, 51, 54, 57, 59, 64, 66, 67, 68, 72, 73, 75, 76, 81, 82, 83, 86, 88, 89, 96, 97, 98, 99, 100, 102, 107, 108, 113, 114, 118, 121, 123, 128, 129, 131
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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n belongs to this sequence iff every prime p == 5,7 mod 8 dividing n occurs to an even power. - Sharon Sela (sharonsela(AT)hotmail.com), Mar 23 2002
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REFERENCES
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L. Euler, (E388) Vollstaendige Anleitung zur Algebra, Zweiter Theil, reprinted in: Opera Omnia. Teubner, Leipzig, 1911, Series (1), Vol. 1, p. 421.
D. H. Lehmer, Guide to Tables in the Theory of Numbers. Bulletin No. 105, National Research Council, Washington, DC, 1941, p. 59.
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LINKS
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L. Euler, Vollstaendige Anleitung zur Algebra, Zweiter Teil.
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CROSSREFS
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Cf. A035251.
Complement of A097700.
Sequence in context: A140752 A055562 A020900 this_sequence A010458 A084829 A018649
Adjacent sequences: A002476 A002477 A002478 this_sequence A002480 A002481 A002482
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KEYWORD
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easy,nonn,nice
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AUTHOR
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njas
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