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A144103
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Least prime p that precedes a gap of exactly 2n+1 numbers containing only one prime.
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0
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3, 5, 23, 19, 47, 83, 211, 109, 317, 619, 199, 1373, 1123, 1627, 4751, 2557, 3413, 4289, 1321, 2161, 2477, 7963, 5591, 9551, 17239, 15823, 14087, 19603, 34963, 36389, 33223, 24251, 35603, 43321, 19609, 134507, 31393, 136999, 31397, 38461, 107357
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| p and p+2n are primes and there is one prime in the range p+1 to p+2n-1.
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FORMULA
| a(n) = prime for which 2n+2 first occurs in A031131.
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MATHEMATICA
| nn=51; t=Table[0, {nn}]; t[[1]]=-1; cnt=1; n=1; While[cnt<nn, n++; d=(Prime[n+2]-Prime[n])/2; If[d<=nn && t[[d]]==0, cnt++; t[[d]]=Prime[n]]]; t=Rest[t]
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CROSSREFS
| Sequence in context: A064187 A112686 A088121 * A137084 A067256 A136891
Adjacent sequences: A144100 A144101 A144102 * A144104 A144105 A144106
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KEYWORD
| nonn
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AUTHOR
| T. D. Noe (noe(AT)sspectra.com), Sep 11 2008
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