66563

Appears in sequences

• Squarefree numbers k with largest prime factor = floor(sqrt(k)).at n=40A071311
• Chebyshev U(n,x) polynomial evaluated at x=129 = 3*43.at n=2A097734
• Composite squarefree numbers n such that p(i)+3 divides n-3, where p(i) are the prime factors of n.at n=9A225713
• Smallest number x such that phi(x) = phi(x(n)), where x(n) is the n-th arithmetic derivatives of x and x is not equal to x(n).at n=14A246775
• a(n) = n^4 + 4*n^2 + 3.at n=16A304726