Hello, My Name Is Àlex, from StcU I have been thinking a lot with the follow of number 9 casuística [URL]https://alkasoft.org/nine/[/URL] I have build an small script to do the next operations: from a given number like 14 we multiply 9 so 126 "Here the trick: 126 is mulitple by 9 so we could remove the last number(6) so be knew the addition from the all the digits has to ber mutiple with 9" so the next is 12 "we are decreasing" we multiply 9 so 108 we remove 8 so is obius (1+0+?=9) .. and go .. 10 * 9 = 90 < (0,3) 9 * 9 = 81 8 * 9 = 72 7 * 9 = 63 6 * 9 = 54 5 * 9 = 45 4 * 9 = 36 3 * 9 = 27 2 * 9 = 18 1 * 9 = 9 < (9,12) only when the last digit is (0 or 9) we have to mark to know it. so the result is [0,3] [9,12] [9,12]: iteration 12 is 9 [0/3]: iteration 3 is 0 Decode output 9 / 9 = 1 18 / 9 = 2 27 / 9 = 3 36 / 9 = 4 45 / 9 = 5 54 / 9 = 6 63 / 9 = 7 72 / 9 = 8 81 / 9 = 9 < (0) 90 / 9 = 10 108 / 9 = 12 126 / 9 = 14 14 Only know whether this could be useful for anything. SOrry for inconviniences