51265domain: NAppears in sequencesNumber of Gaussian primes (in the first half quadrant; i.e., 0 to 45 degrees) with real part <= 2^n.at n=10A186903Number of k < 2^n that are neither squarefree nor prime powers.at n=13A372403Number of points in Z^4 of norm <= n where the sum of the four entries is even.at n=12A380832