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A019669
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Decimal expansion of Pi/2.
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18
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1, 5, 7, 0, 7, 9, 6, 3, 2, 6, 7, 9, 4, 8, 9, 6, 6, 1, 9, 2, 3, 1, 3, 2, 1, 6, 9, 1, 6, 3, 9, 7, 5, 1, 4, 4, 2, 0, 9, 8, 5, 8, 4, 6, 9, 9, 6, 8, 7, 5, 5, 2, 9, 1, 0, 4, 8, 7, 4, 7, 2, 2, 9, 6, 1, 5, 3, 9, 0, 8, 2, 0, 3, 1, 4, 3, 1, 0, 4, 4, 9, 9, 3, 1, 4, 0, 1, 7, 4, 1, 2, 6, 7, 1, 0, 5, 8, 5, 3
(list; constant; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| ln(i)=i*pi/2 [From Eric Desbiaux (moongerms(AT)wanadoo.fr), Jun 27 2009]
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LINKS
| Harry J. Smith, Table of n, a(n) for n = 1..20000
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EXAMPLE
| 1.570796326794896619231321691639751442098584699687552910487472296153908...
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MATHEMATICA
| RealDigits[N[Pi/2, 200]] (* From Vladimir Orlovsky, Dec 02 2009 *)
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PROG
| (PARI) { default(realprecision, 20080); x=Pi/2; for (n=1, 20000, d=floor(x); x=(x-d)*10; write("b019669.txt", n, " ", d)); } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), May 31 2009]
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CROSSREFS
| Cf. A053300 Continued fraction.
Sequence in context: A013706 A195793 A085679 * A088394 A021950 A072417
Adjacent sequences: A019666 A019667 A019668 * A019670 A019671 A019672
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KEYWORD
| nonn,cons
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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