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A087572
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Smallest prime of the form n + (n-1) + (n-2) + ...(n-k), k < n, or 0 if no such prime exists.
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1
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0, 2, 3, 7, 5, 11, 7, 0, 17, 19, 11, 23, 13, 0, 29, 31, 17, 0, 19, 0, 41, 43, 23, 47, 0, 0, 53, 0, 29, 59, 31, 0, 0, 67, 0, 71, 37, 0, 0, 79, 41, 83, 43, 0, 89, 0, 47, 0, 97, 0, 101, 103, 53, 107, 109, 0, 113, 0, 59, 0, 61, 0, 0, 127, 0, 131, 67, 0, 137, 139, 71, 0, 73, 0, 149, 151, 0
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Trivially a(n) = 0 if n and 2n-1 both are composite. i.e. (k = 0 or 1.)
If a(n) > 0 then a(n) = A034694(n-1). - David Wasserman (wasserma(AT)spawar.navy.mil), Jun 07 2005
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CROSSREFS
| Sequence in context: A159842 A045790 A085102 * A085107 A034694 A050921
Adjacent sequences: A087569 A087570 A087571 * A087573 A087574 A087575
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KEYWORD
| nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 17 2003
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EXTENSIONS
| More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Jun 07 2005
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