Migration complete - please let us know if anything isn't working.

# 39311171399719337397

This number is a composite.

3931117139 9719337397

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 <t5k.org> © G. L. Honaker and Chris K. Caldwell