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Search: id:A042974
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| 1, 2, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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The number .121121112... is irrational - Robert G. Wilson v (rgwv(AT)rgwv.com), Jul 05 2000
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REFERENCES
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C. V. Eynden, Problem 10439, Amer. Math. Monthly, 104 (1997), 873.
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,20000
G. Xiao, Contfrac
Index entries for continued fractions for constants
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EXAMPLE
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0.1211211121111211111211111121111111211111111211111111121111111111211111... [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), May 08 2009]
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PROGRAM
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(PARI) a(n)=1+issquare(9+8*n) - Michael Somos, Jan 12 2000.
(PARI) { default(realprecision, 20080); x=0; for (n=1, 20000, x=10*x + 1 + issquare(9+8*n)); x/=10^19999; for (n=1, 20000, d=floor(x); x=(x-d)*10; write("b042974.txt", n, " ", d)); } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), May 08 2009]
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CROSSREFS
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Cf. A042975.
Cf. A056030 = Continued fraction. [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), May 08 2009]
Sequence in context: A025430 A110955 A056731 this_sequence A020906 A097305 A120675
Adjacent sequences: A042971 A042972 A042973 this_sequence A042975 A042976 A042977
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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