A114907 Decimal expansion of twice the twin primes constant defined in A005597.

1, 3, 2, 0, 3, 2, 3, 6, 3, 1, 6, 9, 3, 7, 3, 9, 1, 4, 7, 8, 5, 5, 6, 2, 4, 2, 2, 0, 0, 2, 9, 1, 1, 1, 5, 5, 6, 8, 6, 5, 2, 4, 6, 7, 2, 0, 5, 6, 9, 4, 6, 6, 8, 2, 6, 6, 3, 8, 8, 9, 6, 8, 4, 6, 6, 7, 0, 8, 1, 1, 2, 8, 4, 6, 0, 8, 9, 9, 0, 5, 5, 4, 2, 8, 7, 5, 2, 0, 0, 6, 2, 8, 2, 7, 6, 7, 9, 7, 3, 5, 8, 2

Offset

1,2

Links

Table of n, a(n) for n=1..102.

Alexei Kourbatov, On the distribution of maximal gaps between primes in residue classes, arXiv:1610.03340 [math.NT], 2016-2018.

Eric Weisstein's World of Mathematics, Twin Primes Constant.

Eric Weisstein's World of Mathematics, Prime Constellation.

Formula

Equals 2*A005597 (in the sense of the corresponding decimal numbers).

Example

1.320323631693739147855624220...

Prog

(PARI) 2 * prodeulerrat(1-1/(p-1)^2, 1, 3) \\ Amiram Eldar, Mar 16 2021

Crossrefs

Cf. A005597.

Sequence in context: A286889 A286368 A190710 * A278499 A231132 A290327

Adjacent sequences: A114904 A114905 A114906 * A114908 A114909 A114910

Keyword

nonn,cons

Author

Eric W. Weisstein, Jan 06 2006

Extensions

Corrected offset and edited by M. F. Hasler, Dec 09 2008

Status

approved