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A104296
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a(n+1)=prime((a(n)+1)/2), a(1)=9.
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3
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9, 11, 13, 17, 23, 37, 67, 139, 349, 1039, 3727, 16007, 81853, 492059, 3436987, 27605857, 252391267, 2602897093, 30034790941, 384953881369, 5444681375227, 84482367674813
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| All primes except a(1) which is any odd integer; a(1)=9 is first a(1) giving nontrivial sequence: three cases a(1)=3,5,7 give a(n)=a(1); other a(1)'s A104297-A104304.
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MATHEMATICA
| a[1] = 9; a[n_] := a[n] = Prime[(a[n - 1] + 1)/2]; Table[ a[n], {n, 22}] (from Robert G. Wilson v Mar 24 2005)
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CROSSREFS
| Cf. A104297, A104298, A104299, A104300, A104301, A104302, A104303, A104304.
Sequence in context: A123760 A155877 A120177 * A117675 A027726 A044873
Adjacent sequences: A104293 A104294 A104295 * A104297 A104298 A104299
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KEYWORD
| easy,nonn
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AUTHOR
| Zak Seidov (zakseidov(AT)yahoo.com), Feb 28 2005
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EXTENSIONS
| a(14) - a(22) from Robert G. Wilson v (rgwv(AT)rgwv.com), Mar 24 2005
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