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A139338
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Least k>0 such that sum(i=0,2*n-1,(-k)^i/i!)<0.
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0
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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
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history;
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OFFSET
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1,2
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REFERENCES
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Serge Francinou, Herve Gianella and Serge Nicolas, Exercices de mathematiques : oraux X-ENS, Analyse 1, Cassini Editeur, 2003, p. 119-121
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LINKS
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Table of n, a(n) for n=1..74.
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FORMULA
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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)
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PROG
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(PARI) a(n)=if(n<0, 0, k=1; while(sum(i=0, 2*n-1, (-k)^i*1./i!)>0, k++); k)
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CROSSREFS
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Cf. A030178.
Sequence in context: A156261 A071823 A219642 * A057355 A171975 A160511
Adjacent sequences: A139335 A139336 A139337 * A139339 A139340 A139341
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KEYWORD
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nonn
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AUTHOR
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Benoit Cloitre, Jun 08 2008
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STATUS
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approved
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