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Search: id:A069075
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| 1, 9, 225, 1225, 3969, 9801, 20449, 38025, 65025, 104329, 159201, 233289, 330625, 455625, 613089, 808201, 1046529, 1334025, 1677025, 2082249, 2556801, 3108169, 3744225, 4473225, 5303809, 6245001, 7306209, 8497225, 9828225, 11309769
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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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=1, inf, 1/a(n))=(Pi^2-8)/16
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CROSSREFS
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Sequence in context: A159939 A167038 A074190 this_sequence A012054 A067405 A063386
Adjacent sequences: A069072 A069073 A069074 this_sequence A069076 A069077 A069078
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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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