A038801 -id:A038801 - cp's OEIS frontend

A120120 Number of n-digit prime quadruplets.

1, 3, 7, 26, 128, 733, 3869, 23620, 152141, 1028789, 7188960, 51672312, 381226246, 2873279651

Offset: 2

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

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

J.-L. Baril, Classical sequences revisited with permutations avoiding dotted pattern, Electronic Journal of Combinatorics, 18 (2011), #P178.
Thomas R. Nicely, Enumeration to 1.6*10^15 of the prime quadruplets.

Cf. A006879, A070076, A038801.

a(6) corrected and a(15) supplied by Jon E. Schoenfield, Aug 27 2006

A116356 Number of primes less than n*10^21.

Original entry on oeis.org

21127269486018731928, 41644391885053857293, 61943374158983520871, 82103246362658124007, 102160925813497229402, 122137912741771709423, 142048291427909819758, 161902001837504830333, 181706431926947074426, 201467286689315906290

Offset: 1

Robert G. Wilson v, Feb 04 2006

nonn

Chai Wah Wu, Table of n, a(n) for n = 1..53
Thomas R. Nicely, Some Results of Computational Research in Prime Numbers [See local copy in A007053]

Cf. A000720, A038801, A028505, A038812, A038813, A038814, A038815, A038816, A038817, A038818, A038819.

Cf. A038820, A038821, A038822, A080123, A080124, A080125, A080126, A080127, A080128, A080129.

cp's OEIS Frontend

A120120 Number of n-digit prime quadruplets.

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