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A comment on What is the largest bi-truncatable prime?. Parent comment
7228828176786792552781668926755667258635743361825711373791931117197999133917737137399993737111177 (97 digits)
is indeed the biggest bi-truncatable prime.
This was done under assumption that zero digits are not allowed. If they are allowed, bigger bi-truncatable primes exists, such as:
90072457733413689120801410250233316614403998951220231333193991731791997911317971131797197339199333933 (101 digits)
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7228828176786792552781668926755667258635743361825711373791931117197999133917737137399993737111177 (97 digits)
is indeed the biggest bi-truncatable prime.
This was done under assumption that zero digits are not allowed. If they are allowed, bigger bi-truncatable primes exists, such as:
90072457733413689120801410250233316614403998951220231333193991731791997911317971131797197339199333933 (101 digits)