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|----+----+----+----+----+----2 |IGAM|BETA|IBET|ERF |BESJ|BESY| |----+----+----+----+----+----| |IMAG|CONJ| RE |ATN2|RAND|RAGN| |----+----+----+----+----+----| |GCD |FACT|DFCT|BNOM|PERM|NXTP| |----+----+----+----+----+----|

This menu provides various operations from the `f` and `k`
prefix keys.

<IMAG> multiplies the number on the stack by the imaginary
number ‘`i = (0, 1)`’.

<RE> extracts the real part a complex number. `INV RE`
extracts the imaginary part.

<RAND> takes a number from the top of the stack and computes a random number greater than or equal to zero but less than that number. (See Random Numbers.) <RAGN> is the “random again” command; it computes another random number using the same limit as last time.

<INV GCD> computes the LCM (least common multiple) function.

<INV FACT> is the gamma function.
‘`gamma(x) = (x-1)!`’.

<PERM> is the number-of-permutations function, which is on the
`H k c` key in normal Calc.

<NXTP> finds the next prime after a number. `INV NXTP`
finds the previous prime.