181

This number is a prime.

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

+ 1000 is the 181st positive integer that contains at least one pair of equal digits adjacent to each other. [Gaydos]

+ Is 181 the only prime palindromic prime that produces another when added to its sum of digits? [Gaydos]

(There are 2 curios for this number that have not yet been approved by an editor.)

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