142947

Appears in sequences

• Numbers k such that k^3 divides 17^(k^2) + 1.at n=35A177817
• Number of (w,x,y,z) with all terms in {1,...,n} and 2w*x<=3*y*z.at n=22A211921
• a(n) = Sum_{k=0..floor(n/3)} binomial(n,k) * binomial(n-k-1,n-3*k).at n=14A389327