login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A343480 Decimal expansion of 9 * Product_{p prime >= 5} (1-3/p)/(1-1/p)^3. 2

%I

%S 5,7,1,6,4,9,7,1,9,1,4,3,8,4,4,0,8,6,4,8,6,0,2,6,9,3,2,1,4,5,2,7,0,1,

%T 7,5,6,0,7,8,5,9,1,1,8,5,9,9,1,3,5,2,0,5,8,0,9,7,6,1,0,1,4,4,3,8,1,0,

%U 6,1,5,1,8,0,4,5,2,5,2,6,9,3,8,7,2,2,6

%N Decimal expansion of 9 * Product_{p prime >= 5} (1-3/p)/(1-1/p)^3.

%C This constant appears in the conjectured asymptotic formulas for A343478 and A343479.

%H Carlos Esparza and Lukas Gehring, <a href="https://arxiv.org/abs/1810.08679">Estimating the density of a set of primes with applications to group theory</a>, arXiv:1810.08679 [math.NT], 2018.

%e 5.71649719143844086486026932145270175607859118599135...

%o (PARI) 9 * prodeulerrat((1-3/p)/(1-1/p)^3, 1, 5)

%Y Cf. A343478, A343479.

%K nonn,cons

%O 1,1

%A _Amiram Eldar_, Apr 16 2021

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 9 09:37 EST 2021. Contains 349627 sequences. (Running on oeis4.)