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307

This number is a prime.

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

Smallest nonpalindromic prime with a palindromic square. The next one is 30001253. [Gaydos]

307 permutations of the digits of 2^20 (1048576) are prime numbers. [Gaydos]

307 and its prime index (63) are both reverse triangular numbers. Are there any more examples of this property? [Gaydos]

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