OFFSET
1,2
COMMENTS
Data taken from Alessandro Languasco and Alessandro Zaccagnini 2007 p. 4.
REFERENCES
Steven R. Finch, Mathematical Constants, Cambridge University Press, 2003, Section 2.2 Meissel-Mertens constants (pp. 94-95).
LINKS
Vaclav Kotesovec, Table of n, a(n) for n = 1..497
Alessandro Languasco and Alessandro Zaccagnini, On the constant in the Mertens product for arithmetic progressions. II: Numerical values, Math. Comp. 78 (2009), 315-326.
Alessandro Languasco and Alessandro Zaccagnini, Computation of the Mertens constants - more than 100 correct digits, (2007). [in this table on page 4, the last correct digit is a(108), beyond the level there certified. - Vaclav Kotesovec, Jan 26 2021]
Alessandro Languasco and Alessandro Zaccagnini, On the constant in the Mertens product for arithmetic progressions. I. Identities, Funct. Approx. Comment. Math. Volume 42, Number 1 (2010), 17-27.
For other links see A340711.
FORMULA
EXAMPLE
1.299364547914977988160840014964265909502574970408329662016...
MATHEMATICA
(* Using Vaclav Kotesovec's function Z from A301430. *)
$MaxExtraPrecision = 1000; digits = 121;
digitize[c_] := RealDigits[Chop[N[c, digits]], 10, digits - 1][[1]];
digitize[(13*Pi^2 / (24*Sqrt[5] * Exp[EulerGamma] * Log[(1 + Sqrt[5])/2]) * Z[5, 1, 2]^2 / (Z[5, 1, 4] * Z[5, 4, 4]))^(1/4)]
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Artur Jasinski, Jan 24 2021
EXTENSIONS
Corrected by Vaclav Kotesovec, Jan 25 2021
More digits from Vaclav Kotesovec, Jan 26 2021
STATUS
approved