Hello Benoît The "Look left and say" seq idea came from the "True so far" seq: https://oeis.org/A102357 Best, É. > Le 18 nov. 2019 à 01:03, Benoît Jubin <benoit.jubin at gmail.com> a écrit : > > 10, 12, 13, 14, 15, 16, 17, 18, 19, 20