235808domain: NAppears in sequencesNumbers N such that concatenation of N, N, and x generates a prime for x=1 and x=3 and x=7 and x=9.at n=28A210515Numbers that are the sum of three positive cubes in four or more ways.at n=31A343968Numbers that are the sum of three positive cubes in exactly 4 ways.at n=30A343969