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[Dieter]

(03-07-2016 12:02 PM)ggauny@live.fr Wrote:  Because you said in the past that it is better use not LBL and GTO, but BACK,

Well, it's not better, but faster and it saves a label. But in this case I simply was too lazy to count or calculate the number of steps for the BACK command. ;-)

(03-07-2016 12:02 PM)ggauny@live.fr Wrote:  I have tryed Back 023 in replacing GTO 01, and of course I Ruber the LBL01. It run.

Yes, of course it should.

(03-07-2016 12:02 PM)ggauny@live.fr Wrote:  I know it is possible to do the algorithm you say but I don't know how.

So do I (at the moment ;-)). The Prime program in your attachment uses a similar method in that it calculates the next Friday 13th from the weekday of Jan 13. As far as I know newer versions of the Prime contain date-related commands (correct me if I'm wrong here), so it should be possible to get a more compact program.

Dieter