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A072101 Continued fraction expansion of Product_{p prime} (1 - 1/(p^2-1)). 1
0, 1, 1, 7, 1, 1, 1, 3, 1, 1, 7, 1, 15, 1, 1, 5, 1, 1, 6, 1, 1, 12, 2, 1, 52, 6, 3, 2, 1, 7, 1, 1, 4, 2, 1, 5, 1, 1, 1, 7, 2, 1, 5, 1, 13, 3, 1, 1, 4161, 1, 1, 1, 9, 4, 6, 1, 12, 2, 9, 3, 1, 4, 3, 1, 6, 3, 2, 1, 3, 4, 2, 2, 3, 93, 3, 1, 10, 1, 2, 1, 7, 4, 4, 2, 1, 1, 2, 2, 10, 1, 1, 2, 3, 3, 1, 1, 3, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..97.

Gerhard Niklasch, Some number-theoretical constants: 1000-digit values.

MATHEMATICA

(* c= the value at the link above; *) ContinuedFraction[c, 100]

PROG

(PARI) contfrac(prodeulerrat(1 - 1/(p^2-1))) \\ Amiram Eldar, Mar 13 2021

CROSSREFS

Cf. A065469.

Sequence in context: A174544 A168423 A336844 * A088840 A344696 A336457

Adjacent sequences:  A072098 A072099 A072100 * A072102 A072103 A072104

KEYWORD

cofr,nonn

AUTHOR

Robert G. Wilson v, Jun 18 2002

STATUS

approved

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Last modified September 28 09:32 EDT 2021. Contains 347714 sequences. (Running on oeis4.)