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A120120 Number of n-digit prime quadruplets. 3

%I

%S 1,3,7,26,128,733,3869,23620,152141,1028789,7188960,51672312,

%T 381226246,2873279651

%N Number of n-digit prime quadruplets.

%H J.-L. Baril, <a href="http://www.combinatorics.org/ojs/index.php/eljc/article/view/v18i1p178">Classical sequences revisited with permutations avoiding dotted pattern</a>, Electronic Journal of Combinatorics, 18 (2011), #P178.

%H T. R. Nicely, <a href="https://faculty.lynchburg.edu/~nicely/quads/quads.html">Enumeration to 1.6*10^15 of the prime quadruplets</a>.

%e a(3) = 3 because there are three three-digit prime quadruples: {101, 103, 107, 109}, {191, 193, 197, 199} and {821, 823, 827, 829}.

%Y Cf. A006879, A070076, A038801.

%K nonn,more,base

%O 2,2

%A Julien Peter Benney (jpbenney(AT)ftml.net), Aug 15 2006, Aug 19 2006

%E a(6) corrected and a(15) supplied by _Jon E. Schoenfield_, Aug 27 2006

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Last modified April 14 01:49 EDT 2021. Contains 342941 sequences. (Running on oeis4.)