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Re: Problem with Infinite products


Maxim Rytin,
Actually does run better,
still gives the wrong answers:

Clear[f, zta]
f[n_Integer?Positive, 1] := If[Mod[Prime[n], 12] - 1 == 0, Prime[n], 1/2]
f[n_Integer?Positive, 2] := If[Mod[Prime[n], 12] - 5 == 0, Prime[n], 1/2]
f[n_Integer?Positive, 3] := If[Mod[Prime[n], 12] - 7 == 0, Prime[n], 1/2]
f[n_Integer?Positive, 4] := If[Mod[Prime[n], 12] - 11 == 0, Prime[n], 1/2]
zta[x_, m_] := Module[{n}, Product[f[n, m]^(x)/(-1 + f[n, m]^(x)), {n, 1,
     Infinity}]]
zta[2, 1]
N[%]
zta[2, 2]
N[%]
zta[2, 3]
N[%]
zta[2, 4]
N[%]
N[Product[zta[2, n], {n, 1, 4}]/Zeta[2]]
Maxim wrote:

> 
> zta[x_, m_] := Module[{n},
>    Product[f[n, m]^(x)/(-1 + f[n, m]^(x)), {n, 1, Infinity}]]
> 
> Then Product[zta[2, n], {n, 1, 4}] won't evaluate to zero.
> 
> Maxim Rytin
> m.r at inbox.ru
> 


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