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 A115044 Middle term of smallest arithmetic prime triple with common difference 2n (or 0 if no such prime exists). 1
 5, 7, 11, 11, 13, 17, 17, 0, 23, 23, 0, 29, 0, 31, 37, 0, 37, 43, 41, 43, 47, 0, 0, 53, 53, 0, 59, 0, 0, 67, 0, 67, 71, 71, 0, 79, 0, 0, 89, 83, 0, 89, 0, 0, 101, 0, 97, 101, 101, 0, 109, 107, 0, 131, 113, 0, 127, 0, 0, 131, 0, 127, 131, 0, 0, 137, 137, 0, 179, 0, 0, 149, 0, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS n's for which no prime exists: 8, 11, 13, 16, 22, 23, 26, 28, 29, 31, 35, 37, 38, 41, 43, 44, 46, 50, 53, 56, 58, 59, 61, 64, 65, 68, 70, 71, 73, 74, 76, 79, 80, 83, 85, 86, 88, 91, 92, 97, 98, 100, ... LINKS Table of n, a(n) for n=1..74. MATHEMATICA f[n_] := Block[{k = 2n + 1}, While[k < 10^5 && ! PrimeQ[k] || ! PrimeQ[k - 2n] || ! PrimeQ[k + 2n], k++ ]; If[k >= 10^5, 0, k]] (* Robert G. Wilson v *) CROSSREFS Cf. A098806. Sequence in context: A317769 A104200 A249916 * A206770 A107257 A275515 Adjacent sequences: A115041 A115042 A115043 * A115045 A115046 A115047 KEYWORD nonn AUTHOR Lekraj Beedassy, Feb 28 2006 EXTENSIONS Corrected and extended by Robert G. Wilson v and Zak Seidov, Feb 28 2006 STATUS approved

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Last modified June 5 22:25 EDT 2023. Contains 363138 sequences. (Running on oeis4.)