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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

Table of n, a(n) for n=1..17.

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.)