-1333

Appears in sequences

• a(n) = -n^2 + 9*n + 53.at n=42A126665
• Expansion of 1 - x/(1 - x/(1 - x^2/(1 - x^2/(1 - x^3/(1 - x^3/(1 - x^4/(1 - x^4/ ...))))))), a continued fraction.at n=15A291875
• The Euclid tree with root 1 encoded by semiprimes, read across levels.at n=21A295512
• Dirichlet g.f.: zeta(s-1) / (zeta(s) * zeta(s-2)).at n=36A328502