211681

Properties

Appears in sequences

• Primes that remain prime through 5 iterations of function f(x) = 4x + 9.at n=17A023340
• Primes of the form 16*m^2 + 81, m=1,2,3,...at n=19A087861
• Triangle read by rows: T(n,m) = 1 + ((-1 + binomial(n, m))*(n!)^2)/(m!*(n - m)!).at n=29A174790
• Triangle read by rows: T(n,m) = 1 + ((-1 + binomial(n, m))*(n!)^2)/(m!*(n - m)!).at n=34A174790
• Number of (n+1) X 4 binary arrays with consecutive windows of two bits considered as a binary number nondecreasing in every row and column.at n=35A202330
• Primes of the form 2520k + 1 for some k.at n=32A217588
• Prime numbersat n=18949