Prime a × prime B = 91, then, prime a + prime B =?

Natural numbers with only 1 and its two positive factors are called prime numbers. Prime numbers within 00 have 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97. There are 25 primes in 100. 7 * 13 = 91, so prime a and prime B are 7 and 13 respectively, so prime a + prime B = 20

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1. 91 =? (prime)
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