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A104297
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a(n+1)=prime((a(n)+1)/2), a(1)=21.
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2
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21, 31, 53, 103, 239, 659, 2213, 8887, 42473, 240151, 1584607, 12069311, 105036509, 1034651039, 11438277847, 142253144233, 1946420671121, 29165259660989
(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)=21 the least integer missing in A104296 and A104298.
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MATHEMATICA
| a[1] = 21; a[n_] := a[n] = Prime[(a[n - 1] + 1)/2]; Table[ a[n], {n, 18}] (from Robert G. Wilson v Mar 24 2005)
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CROSSREFS
| Cf. A104296, A104298, A104299, A104300, A104301, A104302, A104303, A104304.
Sequence in context: A113762 A032585 A138822 * A106324 A032013 A176558
Adjacent sequences: A104294 A104295 A104296 * A104298 A104299 A104300
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KEYWORD
| easy,nonn
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AUTHOR
| Zak Seidov (zakseidov(AT)yahoo.com), Mar 20 2005
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EXTENSIONS
| a(14), a(15), a(16), a(17) & a(18) from Robert G. Wilson v (rgwv(AT)rgwv.com), Mar 24 2005
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