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A245287
Decimal expansion of the Landau-Kolmogorov constant C(4,2) for derivatives in L_2(0, infinity).
2
2, 9, 7, 9, 6, 3, 3, 9, 0, 5, 9, 8, 6, 2, 2, 1, 7, 4, 4, 7, 9, 5, 5, 1, 2, 3, 3, 8, 0, 1, 6, 1, 4, 9, 7, 0, 6, 6, 9, 4, 2, 2, 8, 7, 8, 2, 8, 7, 7, 1, 3, 6, 3, 1, 2, 2, 0, 8, 1, 2, 5, 8, 3, 7, 8, 6, 2, 0, 4, 5, 9, 5, 5, 5, 5, 2, 8, 0, 8, 1, 1, 6, 6, 6, 3, 5, 6, 5, 8, 2, 0, 5, 4, 6, 3, 5, 1, 9, 2, 2, 0, 6, 5, 8, 2
OFFSET
1,1
COMMENTS
See A244091.
REFERENCES
Steven R. Finch, Mathematical Constants, Cambridge University Press, 2003, Section 3.3 Landau-Kolmogorov constants, p. 214.
FORMULA
(2/b)^(1/2), where b is the smallest positive root of x^4 - 2*x^2 - 4*x + 1.
EXAMPLE
2.979633905986221744795512338016149706694228782877136312208125837862...
MATHEMATICA
b = Root[x^4 - 2*x^2 - 4*x + 1, 1]; RealDigits[(2/b)^(1/2), 10, 105] // First
CROSSREFS
Sequence in context: A157350 A121837 A160439 * A254595 A137453 A063381
KEYWORD
nonn,cons,easy
AUTHOR
STATUS
approved