3504384domain: NAppears in sequencesNumbers of the form (12^i)*(13^j), with i, j >= 0.at n=23A108771Squares equal to the difference between two successive primes of the form n^2+1.at n=24A216330Perfect powers k (exponent greater than 1) such that k-1 and k+1 are both semiprime.at n=22A276564