Sum of all digits | Desmos

Expression 2: "F" left parenthesis, "x" , right parenthesis equals signum left parenthesis, "x" , right parenthesis Start sum from "n" equals "I" Subscript, "n" "c" "l" "u" "d" "e" "D" "e" "c" "i" "m" "a" "l" "s" , Baseline left parenthesis, negative "c" left parenthesis, "x" , 0 , right parenthesis , right parenthesis to left brace, "x" equals 0 : 0 , floor left parenthesis, log left parenthesis, StartAbsoluteValue, "x" , EndAbsoluteValue , right parenthesis , right parenthesis , right brace , end sum, mod left parenthesis, floor left parenthesis, StartFraction, StartAbsoluteValue, "x" , EndAbsoluteValue Over 10 Superscript, "n" , Baseline , EndFraction , right parenthesis , 10 , right parenthesis

2

Expression 3: "F" left parenthesis, 123.4 5 , right parenthesis

3

Expression 4: "I" Subscript, "n" "c" "l" "u" "d" "e" "D" "e" "c" "i" "m" "a" "l" "s" , Baseline equals 1

4

5

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