13 and 22
The sum of the number of digits in all the numbers between 31 and 400 inclusive is 1041.
13 and 22
I believe here are 51 such numbers.
The answer is 28
Two integers.
The sum of your digits is the total number arrived at after adding two or more numbers.
There are 5460 five digit numbers with a digit sum of 22.
630
Two of them.
This cannot be answered. This will have to be written to where it can be understood.
Armstrong numbers are the sum of their own digits to the power of the number of digits.
28