Re: [math-fun] What is the name of [mod 9 digitsum]

Eric, maybe you have heard of the OEIS? The OEIS is designed to identify a sequence of numbers! You would find this: %I A010888 %S A010888 0,1,2,3,4,5,6,7,8,9,1,2,3,4,5,6,7,8,9,1,2,3,4,5,6,7,8,9,1,2,3,4,5,6,7, %T A010888 8,9,1,2,3,4,5,6,7,8,9,1,2,3,4,5,6,7,8,9,1,2,3,4,5,6,7,8,9,1,2,3,4,5,6, %U A010888 7,8,9,1,2,3,4,5,6,7,8,9,1,2,3,4,5,6,7,8,9,1,2,3,4,5,6,7,8,9,1,2,3,4,5 %N A010888 Digital root of n (repeatedly add digits until reach a single digit). .... Cheers! Neil