Cousin Primes

Cousin primes are numbers wherein two numbers have a gap of four.
==Examples==
7 and 11 are cousin primes.
19 and 23 are cousin primes.
==Largest Known Cousin Primes==
== Integers of Usage ==
There is a constant called “Brun’s constant for cousin primes”, which Marek Wolf used all the cousin primes as denominators with numerators of one that goes up to 242 (4,398,046,511,104) estimated in 1996.
==See Also==
*Twin Primes, wherein the gap is two.
*Sexy Primes, wherein the gap is six.
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Category:Types of Primes