1681
This number is a composite.
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The smallest square whose representations in septenary,
octal and nonary (4621, 3221, 2267) are all prime when read
in decimal. Note that 1681 = 2^4||3^4 i.e., concatenation
of fourth-powers of first two primes. [Bajpai]
Submitted: 2017-01-24 07:54:54; Last Modified: 2020-06-14 18:06:01.
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