Find number property and write RPL program (HP-49G,G+, HP 50g)

[Gerson W. Barbosa]

(09-24-2014 08:01 PM)Thomas Ritschel Wrote:  

(09-24-2014 05:54 PM)Gerson W. Barbosa Wrote:  Also, in order to make the RPL exercise a little bit more interesting, lets introduce item 2.1:

Given a list of Sophie Germain primes, write an RPL program that retuns the corresponding safe prime numbers. For instance:

{ 2 3 5 11 } --> { 5 7 11 23 }

This is very very simple, of course, but trying to get a shortest program as possible might make for a good exercise.

How about the following:

Code:

%%HP: T(3)A(R)F(.);
 \<< 2 * -1 -
 \>>

Subtracting "-1" might seem a bit counterintuitive. But using the more obvious "1 +" would instead append "1" to the list.

Bingo!