66263...79799 (30-digits)

This number is a prime.

6626378631 2646216567 6291379799

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The largest prime in the base of a pyramid and sequence of primes that starts with "3" and obtains new primes in a procedure of preprending or appending one digit at a time on an appropriate side. [Rivera]

Submitted: 2020-07-22 20:19:41; Last Modified: 2020-07-22 21:40:24.