29998999999999999999999

This number is a prime.

                                                   299 9899999999 9999999999

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

+ The smallest prime with an additive persistence (defined in the first curio for 199) equal to the smallest composite number. Can you explain why this book doesn't list a prime with persistence one higher? [Gupta]

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