279927domain: NAppears in sequencesNumbers expressible in more than one way as 6^x-y^2.at n=32A134989Smallest k such that k*2*p(n)^2+1=q is prime, k*2*q^2+1=r, k*2*r^2+1=s, k*2*r^2+1=t, r, s, and t are also prime.at n=14A224496