11 (eleven) is the fifth Prime number.
The first ten primes are: 2, 3, 5, 7, 11, 13, 17, 19, 23. So 11is the 5th prime.
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11 is the 5th smallest prime #
Yes: 2, 3, 5, 7, 11
11 + 12 + 9 = 32
The fifth triangular number is 15