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Search: id:A002161
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| A002161 |
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Decimal expansion of square root of Pi.
(Formerly M4332 N1814)
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+0
26
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| 1, 7, 7, 2, 4, 5, 3, 8, 5, 0, 9, 0, 5, 5, 1, 6, 0, 2, 7, 2, 9, 8, 1, 6, 7, 4, 8, 3, 3, 4, 1, 1, 4, 5, 1, 8, 2, 7, 9, 7, 5, 4, 9, 4, 5, 6, 1, 2, 2, 3, 8, 7, 1, 2, 8, 2, 1, 3, 8, 0, 7, 7, 8, 9, 8, 5, 2, 9, 1, 1, 2, 8, 4, 5, 9, 1, 0, 3, 2, 1, 8, 1, 3, 7, 4, 9, 5, 0, 6, 5, 6, 7, 3, 8, 5, 4, 4, 6, 6, 5
(list; cons; graph; listen)
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OFFSET
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1,2
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COMMENT
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Also Gamma(1/2). - Frank Adams-Watters (FrankTAW(AT)Netscape.net), Apr 07 2006
The integral of the Gaussian function Exp(-x^2) over the real line. - Richard Chapling (r.chappers(AT)gmail.com), Jun 05 2008
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
W. E. Mansell, Tables of Natural and Common Logarithms. Royal Society Mathematical Tables, Vol. 8, Cambridge Univ. Press, 1964, p. XVIII.
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,20000
Index entries for sequences related to the number Pi
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EXAMPLE
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1.7724538509055160272981674833411451827975494561223871282138...
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MATHEMATICA
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RealDigits[N[Sqrt[Pi], 120]][[1]] - Richard Chapling (r.chappers(AT)gmail.com), Jun 05 2008
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PROGRAM
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(PARI) { default(realprecision, 20080); x=sqrt(Pi); for (n=1, 20000, d=floor(x); x=(x-d)*10; write("b002161.txt", n, " ", d)); } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), May 01 2009]
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CROSSREFS
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Cf. A000796.
Sequence in context: A102400 A144860 A113810 this_sequence A083871 A126584 A021568
Adjacent sequences: A002158 A002159 A002160 this_sequence A002162 A002163 A002164
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KEYWORD
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nonn,cons
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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More terms from Frank Adams-Watters (FrankTAW(AT)Netscape.net), Apr 07 2006
Fixed my PARI program, had -n Harry J. Smith (hjsmithh(AT)sbcglobal.net), May 19 2009
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