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A243375
Decimal expansion of 1/(4*K), a constant related to the asymptotic evaluation of the number of positive integers all of whose prime factors are congruent to 1 modulo 4, where K is the Landau-Ramanujan constant.
0
3, 2, 7, 1, 2, 9, 3, 6, 6, 9, 4, 1, 0, 2, 6, 3, 8, 2, 4, 0, 0, 2, 3, 2, 8, 6, 9, 0, 2, 8, 3, 9, 2, 7, 9, 9, 6, 9, 5, 0, 4, 7, 5, 4, 0, 9, 6, 1, 3, 0, 3, 4, 8, 6, 9, 1, 6, 7, 8, 1, 1, 1, 1, 5, 7, 8, 9, 0, 5, 1, 5, 3, 4, 6, 1, 6, 5, 7, 3, 8, 9, 9, 6, 8, 2, 5, 1, 4, 4, 1, 4, 5, 4, 0, 9, 8, 6, 8, 0, 3, 2, 8, 3, 8
OFFSET
0,1
REFERENCES
Steven R. Finch, Mathematical Constants, Cambridge University Press, 2003, Section 2.3 Landau-Ramanujan constant, p. 100.
LINKS
FORMULA
1/(4*K), where K is the Landau-Ramanujan constant.
EXAMPLE
0.327129366941026382400232869028392799695...
MATHEMATICA
digits = 104; LandauRamanujanK = 1/Sqrt[2]*NProduct[((1 - 2^(-2^n))*Zeta[2^n]/DirichletBeta[2^n])^(1/2^(n + 1)), {n, 1, 24}, WorkingPrecision -> digits + 5]; 1/(4*LandauRamanujanK) // RealDigits[#, 10, digits] & // First (* updated Mar 18 2018 *)
CROSSREFS
Cf. A064533.
Sequence in context: A255820 A318436 A369042 * A373485 A369045 A163659
KEYWORD
nonn,cons
AUTHOR
STATUS
approved