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Anonymous
The numbers 11 and 13 are prime twins. Prime twins are consecutive prime numbers that differ by a difference of two. For example, 3 and 5, 7 and 9 are twin primes.
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-3&5 -5&7 -11&13 -17&19 -29&31
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The odd primes less than 20 are: 3 5 7 11 13 17 19