This number is a prime.

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+ The sum of the squares of the first three pentatopic numbers (1, 5, 15). [Silva]

+ 251 starts the first sequence of four consecutive primes containing the Beast number in their repeated differences: 6,6,6. Remember that the Horsemen of the Apocalypse are four. [Silva]

(There are 3 curios for this number that have not yet been approved by an editor.)

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