134141142143

This number is a prime.

                                                               13 4141142143

+ The smallest prime formed by concatenating in order four successive semiprimes, i.e., 134, 141,142 and 143. Curiously all four semiprimes contain one digit 4. [Gupta]

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