82315domain: NAppears in sequencesNumbers k such that the period of the continued fraction for sqrt(k) contains exactly 55 ones.at n=9A031823Numbers n such that phi(reverse(n)) = phi(reverse(n-1)) + phi(reverse(n-2)).at n=33A069969a(0) = 1; a(n) = half of the a(n-1)-th even nontotient number.at n=13A071598