# Proof behind the largest left/right-truncatable prime [closed]

I was doing this question when I came upon the fact that the number of left- or right-truncatable primes is finite. What's the proof behind this being true?

## closed as off-topic by Shailesh, Watson, user91500, choco_addicted, user223391 Oct 1 '16 at 19:53

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• If you allow $0$s inside the number, there are an infinite number of left truncatable primes, including $13,103, 100003, 1000003, 100000000003, 100000000000000003, 1000000000000000003,\ldots$ – Henry Oct 1 '16 at 10:02