Prime forms involving Repunits, R_n.

[Don Reble]

> we should ... get to exponents 10000. ...
> [Only a few sequences] have been searched to that limit.

Yeah, most likely. Let's include the search limit with the sequence.

> Personally I can get to >6500 by letting my computer run over night
> and that is on a 1.2GHz Athlon chip.
> Bob.

In such a search, one might have to prove primality of a number having
thousands of digits. Which technique do you recommend, Bob?
(Perhaps this
    %C A098088 ... n = 1600, 2175, 2978 and 3649 are only probable primes.
 is good enough.)

--
Don Reble  djr at nk.ca