This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A132120 Decimal expansion of the constant obtained through Pierce retro-expansion of the prime sequence. 2
 3, 6, 2, 3, 0, 6, 2, 2, 2, 3, 6, 6, 4, 9, 8, 0, 4, 8, 7, 9, 8, 6, 2, 6, 3, 7, 2, 2, 2, 4, 0, 9, 3, 4, 6, 1, 8, 1, 1, 1, 7, 9, 8, 5, 8, 5, 3, 4, 4, 2, 0, 9, 9, 9, 7, 5, 9, 9, 5, 1, 0, 1, 7, 0, 2, 7, 8, 4, 1, 8, 8, 6, 3, 0, 6, 8, 9, 6, 5, 0 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Paolo P. Lava, Table of n, a(n) for n = 0..1000 Eric Weisstein's World of Mathematics, Pierce Expansion, MathWorld. FORMULA Equals sum_{i=1..infinity} (-1)^(i+1)/A002110(i). EXAMPLE 0.3623062223664980487986263722240934618111798585344209997599510170278418863068... MAPLE Digits := 80 : a := 0 : for i from 1 to 100 do a := a+(-1.0)^(i-1)/mul(ithprime(j), j=1..i) ; print(a) ; od: PROG (PARI) P=1; -sumalt(n=1, (-1)^n/P*=prime(n)) \\ Charles R Greathouse IV, Oct 03 2016 CROSSREFS Cf. A064648. Sequence in context: A058099 A292789 A124085 * A021280 A282728 A193537 Adjacent sequences:  A132117 A132118 A132119 * A132121 A132122 A132123 KEYWORD cons,nonn AUTHOR R. J. Mathar, Oct 31 2007 EXTENSIONS Corrected last entry by Paolo P. Lava, May 28 2013 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 May 26 16:47 EDT 2019. Contains 323597 sequences. (Running on oeis4.)