EUREKA!!!!!!!!!!!!!!!!!!!!!!!!

[Hans Havermann]

Antti Karttunen asked:

> So, please tell us, what is the ground-breaking idea in your primes  
> below?

>> 17989, 179849, 1798487, 17984833, 179848309, 1798483067,  
>> 17984830667, 179848306667, 1798483066669, 17984830666651,  
>> 179848306666507, ...

I can at least verify that:

a(1) = 17989
a(n) = PreviousPrime[10*a(n-1)]

I hope there's more to it than that. ;)

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