104610domain: NAppears in sequencesa(n) = A165966(n)/12.at n=36A166119A118860/210.at n=0A174293Smallest squarefree term of adjacent squarefree pairs in the sequence of practical numbers (A005153).at n=6A268156Matula-Goebel numbers of transitive rooted identity trees (or transitive finitary sets).at n=31A290760