62291domain: NAppears in sequencesNumbers k such that the period of the continued fraction for sqrt(k) contains exactly 33 ones.at n=17A031801Partial sums of (A006899, prefixed by a 1).at n=24A170804G.f. A(x) satisfies: A(x) = (1 + x * A(2*x)) / (1 - x^2 * A(x)).at n=6A349013