14
This number is a composite.
Just showing those entries submitted by 'Schiffman': (Click here to show all)
Lucas (14) + 14 and Lucas (14) - 14 are both prime. We note
that the 14th Lucas number is 843 where both 843 +14 = 857
and 843 - 14 = 829 are prime. [Schiffman]
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