Thread: "Rare" Primes
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Old 2008-08-29, 13:37   #49
R.D. Silverman
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Nov 2003

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Originally Posted by Housemouse View Post
Can you please give me an example of one function that has an infinate number of values, but can be proven to have exactly 10 prime values?
f(x) = x, for x = 2,3,5,7,11,13,17,19,23,29
= x^2 for all other x.
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