OFFSET
0,2
COMMENTS
Constant given on p. 1 of Schlage-Puchta.
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..10000
Jan-Christoph Schlage-Puchta, Sumsets avoiding squarefree integers, arXiv:1105.1305 [math.NT], May 06 2011.
FORMULA
Equals (1/4) - (2/Pi^2).
EXAMPLE
0.047357632715324457112241...
MATHEMATICA
Join[{0}, RealDigits[(1/4) - (2/Pi^2), 10, 100][[1]]] (* G. C. Greubel, Apr 05 2018 *)
PROG
(PARI) (1/4) - (2/Pi^2) \\ G. C. Greubel, Apr 05 2018
(Magma) R:=RealField(100); [(1/4) - (2/Pi(R)^2)]; // G. C. Greubel, Apr 05 2018
CROSSREFS
KEYWORD
AUTHOR
Jonathan Vos Post, May 09 2011
STATUS
approved