In mathematics, is there any conjecture about the existence of an object that was proven to exist but that has not been explicitly constructed to this day? Here

objectcould be any mathematical object, such as a number, function, algorithm, or even proof.

**Answer**

It is known that there is an even integer n≤246 such that there are infinitely many primes p such that the next prime is p+n, but there is no specific n which has been proved to work (although everyone believes that every even n≥2 actually works).

**Attribution***Source : Link , Question Author : lone student , Answer Author : Gerry Myerson*