86457domain: NAppears in sequencesNumbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 28.at n=20A031706Cube of lower triangular matrix of A056857 (successive equalities in set partitions of n).at n=29A078938Second column of PE^3.at n=7A129327a(n) = 441*n^2 + 21.at n=14A158603