110231

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 57 ones.at n=12A031825
• Composite numbers whose prime factors contain no digits other than 1 and 9.at n=33A036309
• Number of power series 1 + c_1*x^1 + c_2*x^2 + ... + c_{n-1}*x^{n-1} + O(x^n) with c_k in {-1, 0, 1} whose reciprocal has the same property.at n=17A244629