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Search: id:A073587
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| A073587 |
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a(n)=a(n-1)*2^n+1 where a(0)=1. |
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+0
2
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| 3, 13, 105, 1681, 53793, 3442753, 440672385, 112812130561, 57759810847233, 59146046307566593, 121131102837896382465, 496152997224023582576641, 4064485353259201188467843073, 66592528027798752271857140908033
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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a(n) = floor(D*2^(n*(n+1)/2)) where D is a constant, D=1.64163256065515386629...=sum(k>=0, 1/2^(k(k+1)/2)) - Benoit Cloitre (benoit7848c(AT)orange.fr), Sep 01 2002
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PROGRAM
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25 A=1 30 for I=1 to 20 40 A=A*2^I+1 50 print A 60 next 70 end
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CROSSREFS
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Sequence in context: A127004 A068168 A098027 this_sequence A061377 A006860 A090537
Adjacent sequences: A073584 A073585 A073586 this_sequence A073588 A073589 A073590
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KEYWORD
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easy,nonn
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AUTHOR
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Felice Russo (felice.russo(AT)katamail.com), Aug 28 2002
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