31765

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has period 89.at n=31A020428
• 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 39.at n=2A031627
• a(1) = 1; a(n) is the smallest integer greater than a(n-1) such that the largest element in the simple continued fraction for S(n)=1/a(1)+1/a(2)+...+1/a(n) equals 2^n.at n=9A109670
• Expansion of Product_{k>=1} (1 + x^k - x^(3*k)) / (1 - x^k).at n=27A266650