- Feb 13, 2013--- In primenumbers@yahoogroups.com, Jack Brennen wrote:
>

Nice point, Jack.

> What is the product over all of the primes p of:

>

> (p^2+1)/(p^2-1) ?

>

> That's a constant that requires EVERY prime in order

> to calculate it.

>

> It turns out to be 5/2. Which is not irrational.

print(zeta(2)^2/zeta(4));

2.5000000000000000000000000000000000000

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