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 A266512 Smallest prime starting a (nonsingular) symmetric n-tuplet of the shortest span (=A266511(n)). 9
 2, 3, 47, 5, 18713, 7, 12003179, 17, 1480028129, 13, 1542186111157, 41280160361347, 660287401247633, 10421030292115097, 3112462738414697093, 996689250471604163, 258406392900394343851 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A similar sequence that allows singular symmetric n-tuples is given in A266583. a(18) <= 824871967574850703732309 (Jaroslaw Wroblewski) a(20) <= 824871967574850703732303 (Natalia Makarova and Jaroslaw Wroblewski) LINKS N. Makarova and C. Rivera, Problem 62. Symmetric k-tuples of consecutive primes. Natalia Makarova and Vladimir Chirkov, Theoretical patterns with a minimal diameter for a(2) - a(50) FORMULA a(n) = A000040(A266584(n)). CROSSREFS Cf. A055380, A065688, A175309, A266511, A266583, A266584. Sequence in context: A191996 A171079 A097929 * A041501 A163488 A215536 Adjacent sequences:  A266509 A266510 A266511 * A266513 A266514 A266515 KEYWORD nonn,more,hard AUTHOR Max Alekseyev, Dec 30 2015 EXTENSIONS a(1)-a(10) from Natalia Makarova a(11)-a(14), a(16) from Dmitry Petukhov a(15), a(17) from Jaroslaw Wroblewski STATUS approved

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Last modified August 11 13:02 EDT 2020. Contains 336428 sequences. (Running on oeis4.)