198900

Appears in sequences

• Numbers with prime factorization pqr^2s^2t^2.at n=17A190379
• Triangle S(n,k) by rows: coefficients of 4^((n-1)/2)*(x^(1/4)*d/dx)^n when n is odd, and of 4^(n/2)*(x^(3/4)*d/dx)^n when n is even.at n=30A223170
• Triangle S(n,k) by rows: coefficients of 4^(n/2)*(x^(3/4)*d/dx)^n when n=0,2,4,6,...at n=16A223528
• Positive integers that have a record number of divisors in Gaussian integers.at n=41A279254
• Numbers c such that there is a Pythagorean triple (a,b,c) such that (A001414(a), A001414(b), A001414(c)) is also a Pythagorean triple.at n=6A337540
• a(n) = (Product_{k=1..pi(n+1)} prime(k)^floor(n/(prime(k)-1) ) )/(n+1)!.at n=48A363596
• a(n) = sigma_1(n) * sigma_2(n).at n=39A379812