543900domain: NAppears in sequencesa(n) is least k such that k and 2k are anagrams in base n (written in base 10).at n=33A023094Denominators a(n) of Pythagorean approximations b(n)/a(n) to sqrt(2).at n=4A195500Integer areas of the Lucas Central triangles of integer-sided triangles.at n=16A231739