245043domain: NAppears in sequencesNumbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 55.at n=8A031733Expansion of x*(1 + x^2 + x^4)/(1 - x - x^3 - x^5 - x^7).at n=28A117761Number of (w,x,y,z) with all terms in {1,...,n} and w^2<=x^2+y^2+z^2.at n=23A212093