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This number is a prime.
Just showing those entries submitted by 'Silva':
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The sum of the digits of first primes up to 223 is 449. Note the prime digits and their squares. [Silva]
The smallest prime showing a repeated prime digit. [Silva]
The smallest prime whose reversal has more than two prime
The smallest prime formed from three prime digits. [Silva]
223 = -01+23+45+67+89. [Silva]
(There are 2 curios for this number that have not yet been approved by an editor.)
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