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A089267
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Continued fraction expansion with iterated 3-fold symmetry.
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2
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0, 1, 1, 23, 1, 2, 1, 18815, 3, 1, 23, 3, 1, 23, 1, 2, 1, 106597754640383, 3, 1, 23, 1, 3, 23, 1, 3, 18815, 1, 2, 1, 23, 3, 1, 23, 1, 2, 1, 18815, 3, 1, 23, 3, 1, 23, 1, 2, 1, 1715738475058821295603924428015888899408203312889855, 3, 1
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OFFSET
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1,4
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LINKS
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FORMULA
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Sum_{k=0..infinity} 1/chebyshev(4^k, 2) = 0.51030927976262776140...
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MATHEMATICA
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nmax = 50; f[m_] := ContinuedFraction[ Sum[ 1/ChebyshevT[4^k, 2], {k, 0, m}]]; A089267 = Catch[ For[m = 1, True, m++, If[ Length[fm = f[m]] > nmax, Throw[ fm[[1 ;; nmax]] ]]]] (* Jean-François Alcover, Sep 19 2012 *)
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PROG
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(PARI) contfrac(suminf(k=0, 1/subst(poltchebi(4^k), x, 2)))
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CROSSREFS
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KEYWORD
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nonn,cofr,nice
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AUTHOR
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STATUS
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approved
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