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5.6.19  The n-th pseudo-prime number : ithprime

ithprime(n) returns the n-th pseudo-prime number.
Input :

ithprime(75)

Output :

379

Input :

ithprime(k) $ (k=1..20)

Output :

2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71

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