39907

Appears in sequences

• Strong pseudoprimes to base 76.at n=26A020302
• a(n) = Sum_{k=0..n} 6^k*N(n,k), with a(0)=1, where N(n,k) = C(n,k) * C(n,k+1)/n are the Narayana numbers (A001263).at n=6A078018
• a(n) = N(6,n), where N(6,x) is the 6th Narayana polynomial.at n=6A090199
• Number of nX5 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 1,4,3,2,0 for x=0,1,2,3,4.at n=9A196926
• Numbers n such that phi(n) = phi(n+12) and n is not divisible by 2.at n=40A217141
• a(n) = P(n, 1, -2*n-1, 1-2*n)/(n+1), P the Jacobi polynomial.at n=6A242369