626335domain: NAppears in sequencesNumbers k such that k and k^2 use only the digits 2, 3, 5, 6 and 9.at n=23A137082Starting values k of Collatz orbits that achieve a new minimum of Product_{j == 4 mod 6 in "3x+1" orbit of k} (j-1)/j.at n=25A391017