Zaxo,
What's the equivalent to that in Pari? I tried this at the beginning of my code. But wont do.

use Math::BigInt lib => 'Pari';
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I can use this with the normal computation

use Math::GMP qw(:constant);
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But when its applied with my "factorial_stirling" subroutine, it became in conflict with my 'use constant statement for PI, EXP and also LOG function.