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This number is a prime.
Just showing those entries submitted by 'Gaydos': (Click here to show all)
The smallest prime p such that the concatenation of p and p^2 is a Cyclops number (331109561). [Gaydos]
331 is the smallest integer n that has the same sums of digits as the nth prime number (2221) and the nth composite number (412). [Gaydos]
The smallest lucky Honaker number. [Gaydos]
(There is one curio for this number that has not yet been approved by an editor.)
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