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Search: id:A059723
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| A059723 |
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Mean of first 2^n nonnegative powers of 3, i.e. (1+3+3^2+...+3^(2^n-1))/2^n. |
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+0
6
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| 1, 2, 10, 410, 1345210, 28953440450810, 26825654846035253786389446010, 46055408506791340513753409614892651037805514032327504332410
(list; graph; listen)
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OFFSET
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0,2
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LINKS
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Harry J. Smith, Table of n, a(n) for n=0,...,11
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FORMULA
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a(n) =(3^(2^n)-1)/2^(n+1)
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EXAMPLE
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a(3)=(1+3+9+27+81+243+729+2187)/8=3280/8=410
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PROGRAM
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(PARI) { for (n=0, 11, write("b059723.txt", n, " ", (3^(2^n) - 1)/2^(n + 1)); ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jun 28 2009]
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CROSSREFS
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Cf. A059721, A059722.
Sequence in context: A079278 A015178 A013034 this_sequence A112449 A011824 A064300
Adjacent sequences: A059720 A059721 A059722 this_sequence A059724 A059725 A059726
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KEYWORD
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nonn
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AUTHOR
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Henry Bottomley (se16(AT)btinternet.com), Feb 07 2001
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