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Search: id:A141796
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| A141796 |
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Composites of the form n/(prime(n-1)-prime(n-2)). |
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+0
1
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| 6, 4, 6, 14, 15, 10, 4, 27, 10, 33, 18, 20, 12, 50, 20, 16, 22, 34, 14, 72, 75, 77, 20, 27, 21, 90, 92, 96, 50, 34, 104, 35, 18, 57, 116, 118, 119, 40, 18, 64, 129, 26, 132, 135, 34, 144, 145, 49, 148, 50, 152, 160, 161, 81, 42, 169, 57, 174, 60, 92, 65, 196, 99, 200, 68, 205
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Listed in order of increasing n.
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EXAMPLE
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For n=12, 12/(prime(12-1)-prime(12-2))=12/(31-29)=6=a(1).
For n=16, 16/(prime(16-1)-prime(16-2))=16/(47-43)=4=a(2).
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MAPLE
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for n from 3 to 1000 do c := n/(ithprime(n-1)-ithprime(n-2)) ; if type(c, 'integer') then if not isprime(c) then printf("%d, ", c) ; fi; fi; od: # R. J. Mathar, Aug 03 2009
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CROSSREFS
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Cf. A000040, A001223, A002808.
Sequence in context: A086057 A065445 A164293 this_sequence A105160 A021611 A011425
Adjacent sequences: A141793 A141794 A141795 this_sequence A141797 A141798 A141799
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KEYWORD
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nonn
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AUTHOR
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Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Sep 15 2008
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EXTENSIONS
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Corrected by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 03 2009
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