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Big Factorial for the HP-42S

Adapted to the HP-42S by Richard Garner

This program calculates approximations for big factorials (N! for N > 253) on the HP-42S. This program was originally written for the 41C and published in the PPC Journal.


Enter a non-negative integer and run BN!. The result is returned in Y (the mantissa) and X (the exponent) and is also shown in the alpha register.



Technical notes:
Binary files for emulators:
Raw binary: bigfact.raw  Binary for HP-42X: bigfact.42x

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