Three: 36, 42, 48.
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There are 6 prime numbers between 31 and 60, or 7 if 31 is included.
There are five prime numbers: 31, 37, 41, 43, and 47.
31,37,41,43,47
There are 2 prime numbers between 30 and 40: 31 and 37.
The sum of the number of digits in all the numbers between 31 and 400 inclusive is 1041.