46631domain: NAppears in sequencesNumbers n such that (6^n-1)^2-2 is prime.at n=18A100901an=n-th smallest integer m=p1*p2*p3, product of 3 odd primes such that d+2m/d are all primes for d dividing 2m.at n=21A128278Monotonic ordering of nonnegative differences 6^i-5^j, for 40>= i>=0, j>=0.at n=25A192194