231295

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 87 ones.at n=25A031855
• G.f.: exp( Sum_{n>=1} A203414(n)*x^n/n ) where A203414(n) = n*Pell(n)*Sum_{d|n} 1/(d*Pell(d)).at n=13A203413