Hello SeqFans, ... with (n+1) being the smallest integer not yet present in the seq. S=2,3,4,5,6,7,8,9,20,23,25,27,29,33,34,35,37,38,43,46,47,50,52,53,... No integer with a "1" digit can enter S, of course, and all primes will appear -- except the ones containing a "1". Best, É. Envoyé d'un aPhone