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Search: id:A069074
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| 24, 120, 336, 720, 1320, 2184, 3360, 4896, 6840, 9240, 12144, 15600, 19656, 24360, 29760, 35904, 42840, 50616, 59280, 68880, 79464, 91080, 103776, 117600, 132600, 148824, 166320, 185136, 205320, 226920, 249984, 274560, 300696, 328440, 357840
(list; graph; listen)
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OFFSET
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0,1
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REFERENCES
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T. J. I'a. Bromwich, Introduction to the Theory of Infinite Series, Macmillan, 2nd. ed. 1949, p. 190.
Konrad Knopp, Theory and application of infinite series, Dover, p. 269
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LINKS
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Konrad Knopp, Theorie und Anwendung der unendlichen Reihen, Berlin, J. Springer, 1922. (Original german edition of "Theory and Application of Infinite Series")
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FORMULA
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sum(n=0, inf, (-1)^n/a(n))=(Pi-3)/4.
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CROSSREFS
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Adjacent sequences: A069071 A069072 A069073 this_sequence A069075 A069076 A069077
Sequence in context: A126411 A137799 A114200 this_sequence A059775 A052762 A099317
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KEYWORD
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easy,nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 05 2002
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