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 A298109 Solution b( ) of the complementary equation a(n) = a(1)*b(n-1) - a(0)*b(n-2) + 2*n - 4, where a(0) = 1, a(1) = 2, b(0) = 3, b(1) = 4, and (b(n)) is the increasing sequence of positive integers not in (a(n)).  See Comments. 2
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 OFFSET 0,1 COMMENTS The increasing complementary sequences a() and b() are uniquely determined by the titular equation and initial values.  The solution a( ) is given at A297832.  See A297830 for a guide to related sequences. Conjecture:  3/2 < a(n) - n*sqrt(2) < 4 for n >= 1. LINKS Clark Kimberling, Complementary equations, J. Int. Seq. 19 (2007), 1-13. MATHEMATICA a = 1; a = 2; b = 3; b = 4; a[n_] := a[n] = a*b[n - 1] - a*b[n - 2] + 2 n - 4; j = 1; While[j < 80000, k = a[j] - j - 1; While[k < a[j + 1] - j + 1, b[k] = j + k + 2; k++]; j++]; k u = Table[a[n], {n, 0, k}]; (* A297834 *) v = Table[b[n], {n, 0, k}]; (* A298109 *) Take[u, 50] Take[v, 50] CROSSREFS Cf. A297830, A297834. Sequence in context: A061208 A325439 A183860 * A184429 A248185 A130269 Adjacent sequences:  A298106 A298107 A298108 * A298110 A298111 A298112 KEYWORD nonn,easy AUTHOR Clark Kimberling, Feb 09 2018 STATUS approved

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Last modified September 20 08:53 EDT 2021. Contains 347579 sequences. (Running on oeis4.)