The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A247551 Decimal expansion of Product_{k>=2} 1/(1-1/k!). 17
 2, 5, 2, 9, 4, 7, 7, 4, 7, 2, 0, 7, 9, 1, 5, 2, 6, 4, 8, 1, 8, 0, 1, 1, 6, 1, 5, 4, 2, 5, 3, 9, 5, 4, 2, 4, 1, 1, 7, 8, 7, 0, 2, 3, 9, 4, 8, 4, 5, 9, 9, 7, 3, 3, 7, 5, 8, 4, 9, 3, 4, 9, 8, 2, 5, 0, 0, 2, 1, 1, 8, 7, 8, 0, 0, 8, 6, 6, 9, 9, 1, 2, 1, 9, 9, 8, 8, 3, 6, 4, 6, 2, 5, 2, 6, 1, 4, 9, 5, 5, 1, 6, 4, 3, 2 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Steven R. Finch, Mathematical Constants II, Encyclopedia of Mathematics and Its Applications, Cambridge University Press, Cambridge, 2018, p. 269. A. Knopfmacher, A. M. Odlyzko, B. Pittel, L. B. Richmond, D. Stark, G. Szekeres, N. C. Wormald, The Asymptotic Number of Set Partitions with Unequal Block Sizes, The Electronic Journal of Combinatorics, Volume 6 (1999), Research Paper #R2. FORMULA Product_{k>=2} 1/(1-1/k!). Equals lim n -> infinity A005651(n) / n!. EXAMPLE 2.5294774720791526481801161542539542411787023948459973375849349825... MAPLE evalf(1/product(1-1/k!, k=2..infinity), 100); # Vaclav Kotesovec, Sep 19 2014 MATHEMATICA digits = 105; RealDigits[NProduct[1/(1-1/k!), {k, 2, Infinity}, WorkingPrecision -> digits+10, NProductFactors -> digits], 10, digits][[1]] (* Jean-François Alcover, Nov 02 2020 *) PROG (PARI) default(realprecision, 150); 1/prodinf(k=2, 1 - 1/k!) \\ Vaclav Kotesovec, Sep 21 2014 CROSSREFS Cf. A005651, A035341, A072605, A140585, A183239, A209668, A261600, A292713, A320566, A327827, A335643. Sequence in context: A131201 A070633 A266256 * A336853 A273580 A272679 Adjacent sequences:  A247548 A247549 A247550 * A247552 A247553 A247554 KEYWORD nonn,cons,easy AUTHOR Vaclav Kotesovec, Sep 19 2014 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 July 28 05:31 EDT 2021. Contains 346317 sequences. (Running on oeis4.)