37874

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 15.at n=27A031603
• a(1) = 1; a(n) = Sum_{k=1..n} a(ceiling((n-1)/k)).at n=47A290845
• a(n) is the number of n-place formulas in first-order logic when variables are allowed to coincide.at n=6A300696