54735domain: NAppears in sequencesNumbers k such that 2k+1, 4k+1, 6k+1 and 8k+1 are primes.at n=27A124409Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 531", based on the 5-celled von Neumann neighborhood.at n=38A272752