The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A139338 Least k > 0 such that Sum_{i=0..2*n-1} (-k)^i/i! < 0. 0
 1, 2, 3, 3, 4, 4, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 11, 11, 12, 12, 13, 13, 14, 15, 15, 16, 16, 17, 17, 18, 18, 19, 20, 20, 21, 21, 22, 22, 23, 24, 24, 25, 25, 26, 26, 27, 27, 28, 29, 29, 30, 30, 31, 31, 32, 32, 33, 34, 34, 35, 35, 36, 36, 37, 37, 38, 39, 39, 40, 40, 41, 41, 42, 43 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 REFERENCES Serge Francinou, Herve Gianella and Serge Nicolas, Exercices de mathématiques : oraux X-ENS, Analyse 1, Cassini Editeur, 2003, pp. 119-121. LINKS Table of n, a(n) for n=1..74. FORMULA a(n) = r*n + o(n) where r is the solution to x + log(x) = 0 and 0 < x < 1: r = 0.56714329040978387299996... (see A030178). PROG (PARI) a(n)=if(n<0, 0, k=1; while(sum(i=0, 2*n-1, (-k)^i*1./i!)>0, k++); k) CROSSREFS Cf. A030178. Sequence in context: A156261 A071823 A219642 * A244229 A317596 A057355 Adjacent sequences: A139335 A139336 A139337 * A139339 A139340 A139341 KEYWORD nonn AUTHOR Benoit Cloitre, Jun 08 2008 STATUS approved

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

Last modified June 9 17:56 EDT 2023. Contains 363183 sequences. (Running on oeis4.)