207643

Properties

Appears in sequences

• Primes p that remain prime through at least 3 iterations of function f(p)=p^2+4.at n=6A116887
• Number of strings of numbers x(i=1..n) in 0..2 with sum i*x(i) equal to n*2.at n=33A184696
• Primes whose base-9 representation is a square in base 10.at n=35A267821
• Number of intersection points formed by drawing the line segments connecting any two lattice points of an n X m convex lattice polygon written as triangle T(n,m), n >= 1, 1 <= m <= n.at n=42A288180
• a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/2)} 2^k * a(k) * a(n-2*k-1).at n=17A352006
• Prime numbersat n=18606