123457

This number is a prime.

When you remove the penultimate (next to the last) digit of 123457 you will end up with yet another prime. Repeat the process for four more primes. [Brod]

The smallest prime formed from the first six imperfect numbers in order. [Beedassy]

The sum of the repunit number 111111 and all truncations of itself plus one is prime. [Loungrides]