164
This number is a composite.
With 164 we can form 3 2-digits numbers.
Those 3 numbers ± 3 are all prime
(16 + 3 = 19, 16 - 3 = 13,
14 + 3 = 17, 14 - 3 = 11,
64 + 3 = 67, 64 - 3 = 61). [Russo]
(There is one curio for this number that has not yet been approved by an editor.)
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