5101
This number is a prime.
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5101 is the concatenation of the lessers of the twin prime pairs (5, 7) and (101, 103). The concatenation of the
greaters, 7 and 103, gives 7103 which is also prime. [Galliani]
The palindromic prime 1464641, which is the smallest palindromic prime with three fours, divides 5101!+1. [Galliani]
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