My guess is you're talking about prime numbers with a prime gap of two.
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The first two consecutive prime numbers that have a difference of 20 are the numbers 887 and 907.
Prime number next to any prime number is called consecutive prime number. Eg:- 2,3,5,7 are prime numbers
4111 and 4127
The numbers 2 and 3 are consecutive prime numbers. Are there other pairs of prime numbers which are consecutive numbers?
The only consecutive prime numbers are 2 and 3.