IMathAS-libretexts

L_n denotes the n^th Lucas number. (L₁ = 1 and L₂ = 3 and L_n = L_n-2 + L_n-1).

Find the 8th Lucas number.

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Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172
Enter DNE for Does Not Exist, oo for Infinity