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

Author

Eric W. Weisstein, Jan 06 2006

Keywords

• nonn
• cons

Examples

			1.320323631693739147855624220...
		

References

• Steven R. Finch, Mathematical Constants, Encyclopedia of Mathematics and its Applications, vol. 94, Cambridge University Press, 2003, Section 2.1, p. 85.

Links

• 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.

Crossrefs

Cf. A005597.

Programs

PARI

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

Formula

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

Extensions

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