32405domain: NAppears in sequencesNumbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 72.at n=4A031750a(n) = 25*n^2 + 5.at n=35A158445Semiprimes p*q such that p*q+p+q, p*q-(p+q), p*q+2*(p+q) and p*q-2*(p+q) are all primes.at n=26A356765Semiprimes of the form k^2 + 5.at n=49A361696