86662

Appears in sequences

• Becomes prime after exactly 9 iterations of f(x) = sum of prime factors of x.at n=3A047828
• Becomes prime or 4 after exactly 10 iterations of f(x) = sum of prime factors of x.at n=13A048132
• Expansion of (2/(3*sqrt(1-4*z)-1+4*z))*((1-sqrt(1-4*z))/(2*z))^k with k=7.at n=7A172064
• a(n) = Sum_{k=0..n} C(n+k,n-k)*C(2*n-k,k).at n=7A183160