61495domain: NAppears in sequencesFibonacci sequence beginning 1, 5.at n=21A022095a(n) = Sum_{k=1..n} k*[ (n/k)*[ (n/k)*[ n/k ] ] ].at n=33A024933Values of x in the solutions to x^2 - 3xy + y^2 + 19 = 0, where 0 < x < y.at n=21A237133Number of vertex cuts in the n-ladder graph P_2 x P_n.at n=7A356828