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Search: id:A002523
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| 1, 2, 17, 82, 257, 626, 1297, 2402, 4097, 6562, 10001, 14642, 20737, 28562, 38417, 50626, 65537, 83522, 104977, 130322, 160001, 194482, 234257, 279842, 331777, 390626, 456977, 531442, 614657, 707282
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OFFSET
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0,2
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COMMENT
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Let Phi_k(x) be the k-th cyclotomic polynomial and form the sequence Phi_k(0), Phi_k(1), Phi_k(2), ... This gives A000027 (k=2), A002061 (k=3), A002522 (k=4), A053699 (k=5), A002061 (k=6), A053716 (k=7), A002523 (k=8), A060883 (k=9), A060884 (k=10), A060885 (k=11), A060886 (k=12), A060887 (k=13), A060888 (k=14), A060889 (k=15), A060890 (k=16), A060891 (k=18), A060892 (k=20), A060893 (k=24), A060894 (k=30), A060895 (k=32), A060896 (k=36).
All odd prime factors of a(n) are congruent to 1 modulo 8. - Nick Hobson Jan 14 2007
Lee and Murty, p. 685: "In spite of these remarkable advances, we are still unable to determine if n^4 + 1 is infinitely often a squarefree number". - Jonathan Vos Post (jvospost3(AT)gmail.com), Sep 18 2007
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REFERENCES
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Jung-Jo Lee and M. Ram Murty, "Dirichlet series and hyperelliptic curves", Forum Math. 19(2007), 677-705.
Mabkhout, M. (1993). "Minoration de P(x4+1)". Rend. Sem. Fac. Sci. Univ. Cagliari 63 (2): 135-148.
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LINKS
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Index entries for sequences related to linear recurrences with constant coefficients
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FORMULA
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O.g.f.: -(1-3*x+17*x^2+7*x^3+2*x^4)/(-1+x)^5 . a(n) = 5a(n-1)-10a(n-2)+10a(n-3)-5a(n-4)+a(n-5) - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 28 2008
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MAPLE
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with (combinat):seq(fibonacci(3, n^2), n=0..29); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Apr 21 2008
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CROSSREFS
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Cf. A005117.
Sequence in context: A155715 A054568 A060352 this_sequence A079889 A053786 A081744
Adjacent sequences: A002520 A002521 A002522 this_sequence A002524 A002525 A002526
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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