200785

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 99.at n=1A031687
• Lexicographically earliest increasing sequence a, b, c, ... such that every partial product (1-x^a), (1-x^a)(1-x^b), (1-x^a)(1-x^b)(1-x^c), ... has coefficients -1, 0, 1 only.at n=27A274768