1822500

Appears in sequences

• Triangle whose (i,j)-th entry is binomial(i,j)*5^(i-j)*9^j.at n=24A038251
• Triangle whose (i,j)-th entry is binomial(i,j)*9^(i-j)*5^j.at n=24A038295
• Triangle T(n, k) = (-1)^n * n! * StirlingS1(n, k)*StirlingS1(n, n-k)/binomial(n, k), read by rows.at n=24A155825
• a(1) = 1, and for n > 1, a(n) = A276086(n) * a(A064989(n)).at n=27A324889
• Square array T(n,k), n >= 1, k >= 1, read by antidiagonals, where T(n,k) = Product_{a=1..n-1} Product_{b=1..k} (4*sin(a*Pi/n)^2 + 4*sin((2*b-1)*Pi/(2*k))^2).at n=26A341739
• a(n) is the smallest nonnegative integer k where exactly n pairs of positive integers (x, y) exist such that x^2 + 11*y^2 = k.at n=17A374160
• Perfect powers k^m, m > 1, omega(k) > 1, such that A053669(k) > A006530(k) that are not also products of primorials, where omega = A001221.at n=24A380452
• Powers k^m, m > 1, where k is neither squarefree nor squareful, and has a primorial kernel but is not a product of primorials.at n=20A389682