1307

This number is a prime.

1307 is a prime number and 1+3+0+7 = 11. Note that 1+1 = 2 is prime. [Aitken]

The smallest prime that can be represented as the sum of the numbers formed by repeating twice each of first n composite numbers, 4, 6, 8, 9, 10, (n=5), i.e., 1307 = 44 + 66 + 88 + 99 + 1010. [Loungrides]