43730

Appears in sequences

• Numbers n such that 3^n + 2^(n-1) is prime.at n=44A082103
• Numbers k such that binomial(4k, k) - 1 is prime.at n=22A125240
• Riordan's general Eulerian recursion: T(n,k) = (k+2)*T(n-1, k) + (n-k) * T(n-1, k-1), with T(n,0) = 1, T(n,n) = 0.at n=39A157012
• a(n) is the position of A051451(n) in A025487.at n=21A346407