MathDB

4

Part of JOM 2024

Problems(1)

Appending 1 or 3

Source: JOM 2024 P4

2/29/2024
Minivan chooses a prime number. Then every second, he adds either the digit 11 or the digit 33 to the right end of his number (after the unit digit), such that the new number is also a prime. Can he continue indefinitely?
(Proposed by Wong Jer Ren)
number theory