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Joined: Jan 1970
The previous response was correct. As explained in the HP15C manual on page 48, the sequence STO f RAN# stores the number in the X register as a new random number seed. A value outside of the range of 0 to 1 is converted to fit within that range. As also noted on page 49, the f keystroke may be omitted for this command in which case STO f RAN# is equivalent to STO ENTER since RAN# is a shift function of the ENTER key. Also the sequence RCL f RAN# recalls the last random number generated which becomes the new random number seed. As also noted in the manual, the f is also not required for this command so that this sequence is equivalent to RCL ENTER. Thus there is no mystery and no undocumented HP15C function. However careful reading of the manual is required sometimes to explain what may appear to be mysterious operations.