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A126226 Continued fraction of Prod_{primes p} ((p-1)/p)^(1/p)). 1
0, 1, 1, 3, 1, 2, 11, 1, 1, 4, 1, 9, 2, 2, 1, 1, 4, 4, 2, 2, 2, 1, 14, 1, 2, 2, 2, 7, 2, 2, 1, 1, 4, 2, 4, 1, 11, 7, 2, 8, 32, 2, 1, 293, 2, 145, 1, 2, 1, 21, 1, 1, 3, 1, 1, 8, 8, 5, 2, 3, 4, 3, 1, 3, 1, 1, 1, 1, 3, 2, 1, 3, 1, 2, 2, 1, 2, 19, 3, 2, 1, 15, 1, 2, 1, 2, 5, 3, 1, 1, 1, 38, 1, 10, 1, 2, 1, 80, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

This might be interpreted as the expected value of phi(n)/n for very large n. - David W. Wilson, Dec 05 2006

LINKS

Table of n, a(n) for n=0..98.

EXAMPLE

0.55986561693237348...

PROG

(PARI) contfrac(exp(-suminf(m=2, log(zeta(m))*sumdiv(m, k, if(k<m, moebius(k)/(m-k), 0)))))

CROSSREFS

Cf. A124175, A085548, A085541, A085964, A085965, A085966, A085967, A085968, A085969.

Sequence in context: A300612 A301354 A229187 * A307665 A144156 A116854

Adjacent sequences:  A126223 A126224 A126225 * A126227 A126228 A126229

KEYWORD

cofr,nonn

AUTHOR

Martin Fuller, Dec 20 2006

STATUS

approved

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Last modified July 9 14:41 EDT 2020. Contains 335543 sequences. (Running on oeis4.)