90875domain: NAppears in sequencesNumbers k such that the period of the continued fraction for sqrt(k) contains exactly 55 ones.at n=10A031823Floor[ concatenation of n+2, n+1 and n divided by 3 ].at n=25A075004G.f. satisfies A(x) = 1 + x*A(x)^3/(1 - x^2*A(x)^6).at n=8A365250