489479

Properties

Appears in sequences

• For any number larger than 2, the primes reached when you start with n and concatenate the sum of its prime factors with its largest prime factor, then repeat the process until you eventually reach a prime, or print a -1 if you never do.at n=19A125674
• Numbers of facially complete 2-connected planar embeddings.at n=13A375617
• Prime numbersat n=40725