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The Lucas sequence is the sequence 1, 3, 4, 7, 11,... where the first term is 1, the second term is 3 and each term after that is the sum of the previous two terms. What is the remainder when the 100th term of the sequence is divided by 20?

 Nov 27, 2021
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100th Lucas Number = 792070839848372253127 mod 20==7 - the remainder.

 Nov 27, 2021

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