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Search: id:A160179
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| A160179 |
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a(1)=2. a(n) equals the product of the previous terms divided by the (n-1)st prime gap. |
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+0
1
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| 2, 2, 2, 4, 8, 128, 8192, 134217728, 9007199254740992
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Start with a(1)=2. Build a(n) as the product of all preceding terms
divided by the n-minus-first prime gap. The sequence is limited to
9 terms because the 10th term is no longer an integer.
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FORMULA
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a(1) =2. a(n) = product_{i=1..n-1} a(i) / A001223(n-1), n>1.
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EXAMPLE
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a(8) = 2*2*2*4*8*128*8192/2 = 134217728.
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CROSSREFS
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Sequence in context: A077993 A099768 A102831 this_sequence A021822 A153986 A130707
Adjacent sequences: A160176 A160177 A160178 this_sequence A160180 A160181 A160182
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KEYWORD
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nonn,fini,full
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AUTHOR
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Valle Rogers (Vallerogers(AT)hotmail.com), May 03 2009
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EXTENSIONS
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Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 16 2009
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