266287972351domain: NAppears in sequencesLeast k such that A072084(k) = n.at n=36A072087a(n) is the smallest prime such that the number of 1's in its binary expansion is equal to the n-th prime.at n=11A081093Primes of the form q*2^h - 1, where q is a Mersenne prime (A000668).at n=31A335874