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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.