197

This number is a prime.

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

+ The sum of the squares of all the four composite digits (4^2 + 6^2 + 8^2 + 9^2). [Silva]

+ The digits contained in two-digit primes under 100, up to 97, sum to 100+97. [Silva]

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

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