1616668118999191

This number is a prime.

                                                           161666 8118999191

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

+ The smallest strobogrammatic prime formed from the concatenation of a pair of 8-digit invertible primes, i.e., (16166681, 18999191). There is another one 16-digit such prime. Can you find it? [Loungrides]

Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell