18919
This number is a prime.
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The smallest five-digit invertible prime such that the sum
of itself and all truncations of itself +/- 1, i.e., (18919
+ 1891 + 189 + 18 + 1) +/- 1 is a twin prime pair {21019,
21017}. [Bajpai]
Submitted: 2020-12-01 20:18:39; Last Modified: 2020-12-01 23:13:38.
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