385875

Appears in sequences

• 1/2+Sum_{n >= 1} a(n)*x^(2*n)/(4^n*(2*n)!) = 1/Pi*EllipticK(x).at n=3A060629
• Let the index of the largest prime power that divides n! be k then the smallest number such that n!*a(n) is a perfect k-th power.at n=6A074190
• a(n) = (3/8)*(n-1)*(n-2)*(27*n^2-137*n+180).at n=15A134176
• a(n) = 9*n^3.at n=35A244728
• Odd bisection of A283983; square root of the largest square dividing A277324.at n=50A283484
• a(n) = A276086(A003415(n)), where A003415 is the arithmetic derivative, and A276086 is the primorial base exp-function.at n=48A327859
• If A327928(n) is zero, a(n) = A003415(n), otherwise a(n) = A327859(n) = A276086(A003415(n)).at n=47A328097
• a(n) = Product_{d|n} (A069934(n) / sigma(d)) where A069934(n) = lcm_{d|n} sigma(d).at n=7A334471
• Numbers which are sum of three squares of positive numbers and also 5 times of the sum of their joint products.at n=26A347969
• Numbers whose k-th arithmetic derivative is zero for some k>0, ordered by their position in A276086.at n=45A351255