4273
This number is a prime.
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The smallest 4-digit prime whose the 4th power begins with four identical digits, i.e., 4273^4=333373881243841. Note that R(4273^4) is prime. [Loungrides]
Submitted: 2015-04-20 14:59:44; Last Modified: 2018-05-20 01:59:03.
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