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 A154629 Period 9: repeat [9, 3, 1, 3, 3, 1, 3, 9, 1]. 1
 9, 3, 1, 3, 3, 1, 3, 9, 1, 9, 3, 1, 3, 3, 1, 3, 9, 1, 9, 3, 1, 3, 3, 1, 3, 9, 1, 9, 3, 1, 3, 3, 1, 3, 9, 1, 9, 3, 1, 3, 3, 1, 3, 9, 1, 9, 3, 1, 3, 3, 1, 3, 9, 1, 9, 3, 1, 3, 3, 1, 3, 9, 1, 9, 3, 1, 3, 3, 1, 3, 9, 1, 9, 3, 1, 3, 3, 1, 3, 9, 1, 9, 3, 1, 3, 3 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Greatest common divisor of (n+1)^2-1 and (n+1)^2+8. - Bruno Berselli, Mar 08 2017 LINKS Colin Barker, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,0,0,0,0,1). FORMULA a(n) = A147674(n)/9. a(n) = A005563(n) / A144454(n+1) for n>0. From Colin Barker, Dec 21 2017: (Start) G.f.: (9 + 3*x + x^2 + 3*x^3 + 3*x^4 + x^5 + 3*x^6 + 9*x^7 + x^8) / ((1 - x)*(1 + x + x^2)*(1 + x^3 + x^6)). a(n) = a(n-9) for n>8. (End) MATHEMATICA With[{n=5}, PadLeft[{}, 9n, {9, 3, 1, 3, 3, 1, 3, 9, 1}]] (* Harvey P. Dale, Oct 22 2011 *) PROG (PARI) Vec((9 + 3*x + x^2 + 3*x^3 + 3*x^4 + x^5 + 3*x^6 + 9*x^7 + x^8) / ((1 - x)*(1 + x + x^2)*(1 + x^3 + x^6)) + O(x^100)) \\ Colin Barker, Dec 21 2017 CROSSREFS Cf. A005563, A144454, A147674. Sequence in context: A097528 A065416 A093312 * A333182 A154489 A187832 Adjacent sequences: A154626 A154627 A154628 * A154630 A154631 A154632 KEYWORD nonn,easy AUTHOR Paul Curtz, Jan 13 2009 STATUS approved

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Last modified April 25 10:22 EDT 2024. Contains 371967 sequences. (Running on oeis4.)