

A072508


Decimal expansion of Backhouse constant.


7



1, 4, 5, 6, 0, 7, 4, 9, 4, 8, 5, 8, 2, 6, 8, 9, 6, 7, 1, 3, 9, 9, 5, 9, 5, 3, 5, 1, 1, 1, 6, 5, 4, 3, 5, 5, 7, 6, 5, 3, 1, 7, 8, 3, 7, 4, 8, 4, 7, 1, 3, 1, 5, 4, 0, 2, 7, 0, 7, 0, 2, 4, 3, 7, 4, 1, 4, 0, 0, 1, 5, 0, 6, 2, 6, 5, 3, 8, 9, 8, 9, 5, 5, 9, 9, 6, 4, 5, 3, 1, 9, 4, 0, 1, 8, 6, 0, 3, 0, 9, 1, 0, 9, 9, 2
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OFFSET

1,2


COMMENTS

The reciprocal (A088751) of Backhouse's constant is the real zero of a certain power series.  T. D. Noe, Oct 14 2003


LINKS

Table of n, a(n) for n=1..105.
S. R. Finch, Backhouse's constant. 1995 [Cached copy, with permission]
Philippe Flajolet, in response to the previous document from S. R. Finch, Backhouse's constant, 1995
S. R. Finch, Kalmar's Composition Constant, Section 5.5 in Mathematical Constants. Cambridge, England: Cambridge University Press, pp. 292295, 2003. [Cached copy, with permission]
S. R. Finch, Kalmar's composition constant, June 5, 2003. [A different version. Cached copy, with permission of the author]
Simon Plouffe, The Backhouse constant
Eric Weisstein's World of Mathematics, Backhouse's Constant.


EXAMPLE

1.4560749485826896713995953...


MATHEMATICA

RealDigits[1/x /. FindRoot[0 == 1 + Sum[x^n Prime[n], {n, 1000}], {x, {0, 1}}, WorkingPrecision > 100]][[1]] (* T. D. Noe, corrected Apr 26 2013 *)


CROSSREFS

Continued fraction is in A074269.
Cf. A030010, A088751, A247818.
Sequence in context: A154916 A327703 A077061 * A075566 A076087 A082486
Adjacent sequences: A072505 A072506 A072507 * A072509 A072510 A072511


KEYWORD

cons,nonn


AUTHOR

Robert G. Wilson v, Aug 03 2002


STATUS

approved



