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A131701
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Decimal expansion of the continued fraction 4+6/(9+10/(14+15/21+...)) where the terms are the semiprimes: A001358.
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0
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4, 6, 1, 9, 7, 7, 6, 8, 9, 0, 3, 3, 0, 3, 6, 8, 9, 3, 8, 0, 6, 8, 2, 1, 1, 9, 9, 6, 8, 4, 3, 7, 4, 2, 3, 8, 4, 0, 1, 7, 2, 8, 2, 5, 5, 6, 4, 4, 1, 2, 9, 2, 3, 3, 8, 9, 8, 4, 2, 0, 8, 2, 3, 2, 9, 6, 3, 7, 4, 4, 6, 3, 0, 8, 4, 4, 2, 5, 9, 6, 4, 4, 8, 6, 7, 2, 8, 7, 1, 8, 8, 0, 3, 1, 6, 6, 5, 0, 8, 2, 3, 6, 4, 2, 8
(list; constant; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| 4.6197768903303689380682119968437423840172825564412923389842082329...
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MATHEMATICA
| semiPrimeQ[n_] := Plus @@ Last /@ FactorInteger@n == 2; lst = Select[Range@ 400, semiPrimeQ@ # &]; First@ RealDigits@ N[ Fold[ Last@ #2 + First@ #2/#1 &, 4, Partition[Reverse@ lst, 2]], 111] (* Robert G. Wilson v *)
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CROSSREFS
| Cf. A001358, A113011.
Sequence in context: A197020 A202321 A195425 * A021688 A119439 A090642
Adjacent sequences: A131698 A131699 A131700 * A131702 A131703 A131704
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KEYWORD
| cons,nonn
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AUTHOR
| Jonathan Vos Post (jvospost3(AT)gmail.com) & Robert G. Wilson v (rgwv(AT)rgwv.com), Sep 08 2007
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