36747domain: NAppears in sequencesa(n) = ceiling(a(n-1)*4/3), with a(1) = 1.at n=34A087192Number of 6k+1 primes (A002476) in range ]2^n,2^(n+1)].at n=19A095015a(n) = 25 + floor( Sum_{j=1..n-1} a(j)/2 ).at n=18A120148Numbers whose arithmetic derivatives are a permutation of their digits.at n=40A225902