199

This number is a prime.

Just showing those entries submitted by 'Silva': (Click here to show all)

+ The smallest prime showing a repeated composite digit. [Silva]

+ The sum of the digits of all three-digit palindromic primes. [Silva]

+ The smallest prime which is the sum of composite digits appearing in first primes up to itself. [Silva]

(There is one curio for this number that has not yet been approved by an editor.)

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