Fermat's Library (@fermatslibrary) twitteó a las 9:15 a. m. on mié, dic 19, 2018:
There is a sequence of digits that is not prime in any base
Proof: 121 is an example. In base-b, 121 = 1b²+2b+1 = (b+1)(b+1), thus not prime! https://t.co/f3djeRqroe
(https://twitter.com/fermatslibrary/status/1075386551054581760?s=03)
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