This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A215016 Decimal expansion of the product of 1 - 1/2^2^n over all n >= 0. 2
 3, 5, 0, 1, 8, 3, 8, 6, 5, 4, 3, 9, 5, 6, 9, 6, 0, 8, 8, 6, 6, 5, 5, 4, 5, 2, 6, 9, 6, 6, 1, 7, 8, 8, 6, 7, 6, 4, 2, 0, 8, 6, 5, 0, 2, 1, 7, 6, 9, 2, 1, 7, 6, 9, 7, 0, 6, 4, 8, 2, 3, 3, 8, 6, 0, 4, 8, 2, 5, 6, 3, 0, 5, 3, 6, 8, 6, 9, 6, 4, 4, 1 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Can be used to efficiently compute A014571:  A014571 = 1/2 - 1/4 * A215016. LINKS Joerg Arndt, Matters Computational (The Fxtbook), p.727 (rel. 38.1-5). R. Schroeppel and R. W. Gosper, HACKMEM #122 (1972). EXAMPLE 0.35018386543956960886655452696617886764208650217692176970648233860482563... MATHEMATICA RealDigits[Product[1 - 1/2^2^n, {n, 0, Infinity}], 10, 100][[1]] (* Alonso del Arte, Jul 31 2012 *) PROG (PARI) prodinf(n=0, 1-1.>>2^n) CROSSREFS Sequence in context: A291207 A058813 A132701 * A212394 A010614 A153099 Adjacent sequences:  A215013 A215014 A215015 * A215017 A215018 A215019 KEYWORD nonn,cons AUTHOR Charles R Greathouse IV, Jul 31 2012 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified August 21 22:32 EDT 2019. Contains 326169 sequences. (Running on oeis4.)