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A089267
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Continued fraction expansion with iterated 3-fold symmetry.
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1
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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
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,4
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LINKS
| H. Cohn, Symmetry and specializability in continued fractions
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FORMULA
| sum(k=0, inf, 1/chebyshev(4^k, 2)) = 0.51030927976262776140...
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PROG
| (PARI) contfrac(suminf(k=0, 1/subst(poltchebi(4^k), x, 2)))
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CROSSREFS
| Cf. A007400.
Sequence in context: A015151 A040539 A040540 * A040538 A040537 A040542
Adjacent sequences: A089264 A089265 A089266 * A089268 A089269 A089270
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KEYWORD
| nonn,cofr,nice
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AUTHOR
| Ralf Stephan (ralf(AT)ark.in-berlin.de), Oct 30 2003
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