88888...88887 (2691-digits)

This number is a prime.

Just showing those entries submitted by 'Bakker': (Click here to show all)

Largest known near-repdigit-prime with 8 and 7. 2690 eights ending with one seven. Proven (1-11-02) by the 'PRIMO' program with an AMD Athlon 1.4 MHz computersystem, taking about 134 hours of dedicated computingtime. [Bakker]