90124

Appears in sequences

• Floor-Sqrt transform of the binomial coefficients binomial(3*n,n) (A005809).at n=13A192663
• The first primorial based variant of arithmetic derivative: a(prime(i)) = A002110(i-1), where prime(i) = A000040(i), a(u*v) = a(u)*v + u*a(v), with a(0) = a(1) = 0.at n=51A328768