13741

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13741 is the smallest natural number n such that both n and n+6 are base-2 pseudoprimes. There are only 2 such pairs less than 10^13, and one may call them "sexy pseudoprimes" just like 4369 and 4371 are called "twin pseudoprimes." [Yosei]

Submitted: 2019-07-13 11:43:29; Last Modified: 2022-02-21 04:15:44.