only one: 2.
'2' is the only even Prime number. All other even numbers have '2' as a factor.
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101
Composite. Even numbers higher than 2 are not Primes.
301
There are 8 twin primes less than 100. 3,5 : 5,7 : 11,13 : 17,19 : 29,31 : 41,43 : 59,61 : 71,73
Because if x and y differ by three, then either x or y has to be an even number. The only even prime is 2.