156254domain: NAppears in sequencesa(n) = floor(4th elementary symmetric function of Sum_{j=1..k} 1/j, k = 1,2,...,n).at n=14A025214Numbers k such that 2^k + 19 is prime.at n=11A057221Number of distinct n-digit suffixes generated by iteratively multiplying an integer by 4, where the initial integer is 1.at n=7A362468