1111235916285193

                                                           111123 5916285193

+ After 11, the smallest prime concatenated from the number of n-bead necklaces with beads of 2 colors and primitive period n, when turning over is not allowed but the two colors can be interchanged. [Post]

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