619697

Appears in sequences

• Solutions k of the equation phi(k) = phi(k-1) + phi(k-2). Also known as Phibonacci numbers.at n=37A065557
• Composite numbers k such that phi(k) = phi(k-1) + phi(k-2).at n=13A065572
• a(n) = smallest k satisfying the equation phi(k) = phi(k-1) + phi(k-2) and having just n prime factors.at n=2A065604