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Also decimal expansion of the probability that an integer triple (x, y, z) is pairwise coprime. - Charles R Greathouse IV, Nov 14 2011
Table of n, a(n) for n=0..97.
G. Niklasch, Some number theoretical constants: 1000-digit values
G. Niklasch, Some number theoretical constants: 1000-digit values [cached copy]
László Tóth, The probability that k positive integers are pairwise relatively prime, Fibonacci Quart., 40 (2002), 13-18.
Eric Weisstein's World of Mathematics, Carefree Couple
(PARI) prodeuler(p=2, 1e7, t=1-1./p; t^2*(t+3/p)) \\ Charles R Greathouse IV, Nov 14 2011
Sequence in context: A021890 A199504 A019914 * A054029 A197589 A124356
Adjacent sequences: A065470 A065471 A065472 * A065474 A065475 A065476
N. J. A. Sloane, Nov 19 2001
Name corrected by Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 03 2003