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A115206
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Least number d such that p(n) -/+ 2d form a prime pair; p(n) being the n-th prime.
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0
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1, 2, 3, 3, 3, 6, 3, 6, 6, 3, 6, 12, 3, 3, 6, 9, 3, 6, 3, 9, 12, 9, 15, 6, 3, 3, 15, 12, 12, 9, 15, 6, 9, 6, 3, 18, 15, 3, 6, 9, 21, 15, 15, 21, 6, 30, 15, 24, 3, 6, 15, 6, 3, 3, 6, 21, 3, 6, 27, 12, 12, 21, 18, 18, 9, 15, 18, 9, 3, 21, 15, 3, 15, 18, 15, 12, 9, 6, 15, 6, 6, 12, 9, 12, 9, 42, 9
(list; graph; refs; listen; history; internal format)
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OFFSET
| 3,2
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FORMULA
| a(n)=A078611(n)/2.
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MATHEMATICA
| f[n_] := Block[{k = 1, p = Prime@n}, While[ !PrimeQ[p - 2k] || !PrimeQ[p + 2k], k++ ]; k]; Table[f[n], {n, 3, 90}] - Robert G. Wilson v (rgwv(at)rgwv.com), Mar 14 2006
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CROSSREFS
| Sequence in context: A133700 A087688 A126854 * A093653 A205442 A049982
Adjacent sequences: A115203 A115204 A115205 * A115207 A115208 A115209
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KEYWORD
| nonn
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AUTHOR
| Lekraj Beedassy (blekraj(AT)yahoo.com), Mar 04 2006
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EXTENSIONS
| Corrected by N. J. A. Sloane (njas(AT)research.att.com), Mar 05 2006
More terms from Robert G. Wilson v (rgwv(at)rgwv.com), Mar 14 2006
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