72173...17999 (83-digits)

This number is a prime.

721 7373655299
6866735119 7964859567 6894599937 1377377779 7133337931 7179713397 1739117999

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A bi-truncatable prime, i.e., in each step the leftmost and the rightmost digits are simultaneously eliminated. [Rivera]

Submitted: 2019-03-31 14:06:06; Last Modified: 2019-04-05 15:03:36.