152514domain: NAppears in sequencesNumber of primes of the form x^4 + 1 less than 10^n.at n=25A214452Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 249", based on the 5-celled von Neumann neighborhood.at n=19A280337