3191
This number is a prime.
The number of composites between each of the successive
primes after the 3191-th prime are the digits of 3191 read
left-to-right. E.g., The 3191-th prime is 29383; and 29383
(3) 29387 (1) 29389 (9) 29399 (1) 29401. No larger example is known. [Gaydos]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell