1021

This number is a prime.

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Note that in the matrix product:
[ 1 0 ] [ 2 3 ]   [ 2 3 ]
                =
[ 2 1 ] [ 1 1 ]   [ 5 7 ]
1021 is prime, 2311 is prime, 2, 3, 5 and 7 are the first four primes (and incidentally, 2357 is prime). This is the only pair of 2-by-2 matrices with this property. [Hartley]

Submitted: 2009-02-10 18:52:39;   Last Modified: 2020-07-26 14:48:14.
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