262505

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 53.at n=14A031641
• a(n) = Sum_{k=1..n} (n/gcd(k,n))^(gcd(k,n) - 1).at n=37A342421
• a(n) = n^2 + 2^(n-1).at n=18A362438