107
This number is a prime.
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Many Lucas numbers are not prime, but "Lucas" is (chemically) prime if we add the atomic numbers of
Lu(tetium), Ca(lcium) and S(ulphur): 71 + 20 + 16 = 107. [Necula]
Submitted: 2004-01-27 22:04:51; Last Modified: 2014-08-09 18:22:19.
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