101823

Appears in sequences

• Becomes prime or 4 after exactly 10 iterations of f(x) = sum of prime factors of x.at n=20A048132
• Numbers n such that a(n) is prime, where a(n) = a(n-1) + a(n-2), a(1) = 3794765361567513, a(2) = 20615674205555510.at n=15A108156