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The Lucas numbers are defined in the same way, but with different starting values. Let L_0 be the zeroth Lucas number and L_1 be the first. If

L_0 = 1

L_1 = 3

L_n = L_(n - 1) + L_(n - 2)

 

Find L_(20)

 Oct 30, 2020
 #1
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By your count, here are first 20 Lucas numbers.

 

1 , 3 , 4 , 7 , 11 , 18 , 29 , 47 , 76 , 123 , 199 , 322 , 521 , 843 , 1364 , 2207 , 3571 , 5778 , 9349 , 15127, 24476 [This is the 20th Lucas number by your count!!].

 Oct 30, 2020

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