A number theory problem by sudoku subbu
Number Theory
Level
3
how many numbers from 11 to 99 have the sum of the digits a square number
14
15
16
17
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1 solution
The sum of digits range from 2 to 18, and the square numbers between 2 and 18 are 4 and 9 and 16.
Total: 4+9+3=16