17

This number is a prime.

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

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+ The sum of digits of the square of 17 is its twin prime. [Silva]

+ The smallest prime average of seven consecutive primes: 7, 11, 13, 17, 19, 23, 29. [Silva]

+ Emirp 17 yields three other emirps if 1, 7, and 1+7 zeros are sandwiched between its digits. Obviously, the same can be said of emirp 71. [Silva]

+ The sum of the digits of first primes up to emirp 17 is the next emirp. [Silva]

+ If in each of the twin primes 17 and 19 you sandwich the last digit 9, you will obtain a pair of three-digit twin primes (197, 199). [Silva]

(There are 15 curios for this number that have not yet been approved by an editor.)

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