152056domain: NAppears in sequencesNumbers k such that the period of the continued fraction for sqrt(k) contains exactly 71 ones.at n=17A031839Partial sums of the third power of the arithmetic derivative function A003415.at n=23A231946Expansion of g.f. A(x) satisfying 1 = Sum_{n>=0} x^n / (1 - (-x)^(n+1)*A(x)).at n=12A363306