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A064619
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Decimal expansion of sqrt(2*log(2)).
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5
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1, 1, 7, 7, 4, 1, 0, 0, 2, 2, 5, 1, 5, 4, 7, 4, 6, 9, 1, 0, 1, 1, 5, 6, 9, 3, 2, 6, 4, 5, 9, 6, 9, 9, 6, 3, 7, 7, 4, 7, 3, 8, 5, 6, 8, 9, 3, 8, 5, 8, 2, 0, 5, 3, 8, 5, 2, 2, 5, 2, 5, 7, 5, 6, 5, 0, 0, 0, 2, 6, 5, 8, 8, 5, 4, 6, 9, 8, 4, 9, 2, 6, 8, 0, 8, 4, 1, 8, 1, 3, 8, 3, 6, 8, 7, 7, 0, 8, 1
(list; constant; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| Constant arising from birthday paradox: if the year has n days, the number of people required so that the probability that at least two of them have the same birthday is 1/2 approaches 1.1774100225...*sqrt(n) for large n.
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REFERENCES
| W. Feller, An Introduction to Probability Theory and Its Application, Vol. 1, 2nd ed. New York: Wiley, p. 31, 1968.
B. Barwell, Journal of Recreational Mathematics, Soln. to Prob. 2393:"Matching Birthdays on Mars" 30(1) 71 1999-2000.
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LINKS
| Harry J. Smith, Table of n, a(n) for n=1,...,20000
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EXAMPLE
| 1.1774100225...
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PROG
| (PARI) { default(realprecision, 20080); x=sqrt(2*log(2)); for (n=1, 20000, d=floor(x); x=(x-d)*10; write("b064619.txt", n, " ", d)) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Sep 20 2009]
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CROSSREFS
| Cf. A051008.
Sequence in context: A199508 A136478 A097903 * A198544 A086315 A185577
Adjacent sequences: A064616 A064617 A064618 * A064620 A064621 A064622
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KEYWORD
| cons,nonn
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AUTHOR
| Henrik Johansson (johansson.henrik(AT)home.se), Jun 06 2002
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