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Hopefully this one will lead to a good number of solutions.
Rodion, the problem description and Setter/Solver code are in your e-mail.
Clive, thanks a lot, it is ready now! Just upon reading your letter I understood that Christmas is coming in a couple of days so seemingly your problem becomes another Christmas puzzle :)
Meanwhile I recollected couple of similar puzzles in some book of my childhood:
truck driver noticed 15951
reading on speedometer (rather, "kilometrage") and wondered "probably next symmetrical
number won't pop up soon" - but it "popped" in two hours, so the question is the truck speed;
the book is published in 1961
so we wonder when is going to happen next "rotational-symmetry" year (these seemingly
happen more rare and it depends on which digits we consider "rotational" at all - I guess 1,2,5,6,8,9,0).
I, for one, would like to point out that the number for this problem is a palindrome.
Thanks, Clive. This is a nice one.