7583
This number is a prime.
Googol-6 is the product of three distinct prime numbers, and the middle one is 7583. The complete factorization is 2 x 7583 x
659369642621653699063695107477251747329552947382302518792034814717130423315310563101674798892259
=
9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999994. [Keith]
The largest prime such that the sum of squares of its external digits equals the number formed by its internal digits: 72 + 32 = 58. [Gudipati]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Reginald McLean