RPL second impressions (HP 28)

[DavidM]

(07-01-2018 08:51 PM)Thomas Klemm Wrote:  I'd be interested to know how long it takes on a real HP-28 to verify that 177777773 or 999999999989 are primes.

I don't have a 28 (C or S), but I don't believe the HEAD/TAIL functions exist for those models. At least they don't for the 48sx, so I'd be surprised if they were included on the 28.

So replacing those commands with

HEAD: 1 GET
TAIL: 2 OVER SIZE SUB

...allowed me to at least try your suite on a 48sx. Primality testing for 999999999989 completed in about 75 seconds. The 28 systems would obviously take longer -- someone more familiar with the relative performance of the 28's and 48's could probably give more insight. I know this isn't exactly what you were looking for, but perhaps it will give you some idea of what to expect until someone has the chance to enter the programs on a 28.