The sequence 13, 31, 46, 63, 81, 97, 112, 130, 148, 162, ..., (soon in the oeis) shows the largest digital sum the square of an n-digit (decimal) number has.
Is this sequence strictly increasing?
The largest digital sum of the square of an n-digit number
Bernardo Recamán Santos
- 3.7k
- 15
- 39