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Search: id:A087694
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| A087694 |
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Number of non-congruent solutions to x^2 + xy + y^2 = 0 mod n. |
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+0
2
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| 1, 1, 3, 4, 1, 3, 13, 4, 9, 1, 1, 12, 25, 13, 3, 16, 1, 9, 37, 4
(list; graph; listen)
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OFFSET
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1,3
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FORMULA
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Multiplicative with a(3^e) = 3^e, a(p^e) = ((p-1)*e+p)*p^(e-1) if p mod 3 = 1, a(p^e) = p^(2*floor(e/2)) if p mod 3 = 2. - Vladeta Jovovic (vladeta(AT)eunet.rs), Sep 27 2003
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CROSSREFS
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Cf. A000086.
Sequence in context: A128529 A131228 A131129 this_sequence A010262 A105579 A124446
Adjacent sequences: A087691 A087692 A087693 this_sequence A087695 A087696 A087697
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KEYWORD
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mult,nonn
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AUTHOR
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Yuval Dekel (dekelyuval(AT)hotmail.com), Sep 27 2003
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