98 = 2 x 7 x 7
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31 & 67
31 & 67
Just go to a table of prime numbers, find the prime numbers, and add them.Just go to a table of prime numbers, find the prime numbers, and add them.Just go to a table of prime numbers, find the prime numbers, and add them.Just go to a table of prime numbers, find the prime numbers, and add them.
100
The only two digit numbers whose digits add up to 17 are 89 and 98. Since 98 is an even number, 89 is prime.