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A078585 Decimal expansion of Sum_{n>=0} 1/4^(2^n). 12
3, 1, 6, 4, 2, 1, 5, 0, 9, 0, 2, 1, 8, 9, 3, 1, 4, 3, 7, 0, 8, 0, 7, 9, 7, 3, 7, 5, 3, 0, 5, 2, 5, 2, 2, 1, 7, 0, 3, 3, 1, 1, 3, 7, 5, 9, 2, 0, 5, 5, 2, 8, 0, 4, 3, 4, 1, 2, 1, 0, 9, 0, 3, 8, 4, 3, 0, 5, 5, 6, 1, 4, 1, 9, 4, 5, 5, 5, 3, 0, 0, 0, 6, 0, 4, 8, 5, 3, 1, 3, 2, 4, 8, 3, 9, 7, 2, 6, 5, 6, 1, 7, 5, 5, 8 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET
0,1
LINKS
Aubrey J. Kempner, On Transcendental Numbers, Transactions of the American Mathematical Society, volume 17, number 4, October 1916, pages 476-482.
FORMULA
Equals -Sum_{k>=1} mu(2*k)/(4^k - 1), where mu is the Möbius function (A008683). - Amiram Eldar, Jul 12 2020
Equals A007404 - 1/2. - Kevin Ryde, Nov 11 2020
EXAMPLE
0.316421509021893143708079737530525221703311375920552804341210903843055...
MATHEMATICA
RealDigits[ N[ Sum[1/4^(2^n), {n, 0, Infinity}], 110]][[1]]
PROG
(PARI) { default(realprecision, 20080); x=suminf(n=0, 1/4^(2^n)); x*=10; for (n=0, 20000, d=floor(x); x=(x-d)*10; write("b078585.txt", n, " ", d)); } \\ Harry J. Smith, May 11 2009
CROSSREFS
Continued fraction is given in A006464.
Sequence in context: A207615 A209165 A121437 * A116551 A213783 A163330
KEYWORD
cons,nonn
AUTHOR
Robert G. Wilson v, Dec 01 2002
STATUS
approved

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Last modified March 19 03:33 EDT 2024. Contains 370952 sequences. (Running on oeis4.)