Largest Right-Truncatable Primes allowing 1

Theorem
Let $1$ be temporarily considered to be a prime number.

Under that consideration, the largest right-truncatable prime numbers are:


 * $1 \, 979 \, 339 \, 333$
 * $1 \, 979 \, 339 \, 339$

Proof
We have that:

For both, the truncation process is the same: