313

This number is a prime.

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

+ The smallest prime number that is a substring of the concatenation, in either order, of the next two primes (331 and 317). The next four such primes are 111091, 777781, 1131113, and 3333313. [Gaydos]

(There are 2 curios for this number that have not yet been approved by an editor.)

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