906304domain: NAppears in sequencesSquares with initial digit '9'.at n=28A045793a(n) = ((1+sqrt(11))^n-(1-sqrt(11))^n)^2/44.at n=5A144044Numbers with prime factorization p^2*q^2*r^6 where p, q, and r are distinct primes.at n=25A190469