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]