54572...17991 (30-digits)

This number is a prime.

5457218978 9429924839 3823917991

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The largest prime in the base of a pyramid and sequence of primes that starts with "2" and obtains new primes in a procedure of preprending or appending one digit at a time on an appropriate side. [Rivera]

Submitted: 2020-07-23 06:53:01; Last Modified: 2020-07-23 22:08:31.