# 39311171399719337397

This number is a composite.

3931117139 9719337397

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

A composite string S formed from the digits 1, 3, 7 and 9. There are 74 primes embedded in S, read left-to-right only. This is the maximal quantity known for 20 digits. Found by Dmitry Kamenetsky. [Rivera]

Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell