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AMC10 2027 - Self-practice Set 7 Question 17

AMC10 · AMC10 2027 - Self-practice Set 7

Question 17

Let $L_1 = 1,$ $L_2 = 3,$ and $L_{n+2} = L_{n+1} + L_n$ for $n \ge 1.$ How many terms in the sequence $L_1,$ $L_2,$ $L_3,$ $\ldots,$ $L_{2023}$ are even?
  1. $673$
  2. $1011$
  3. $675$
  4. $1010$
  5. $674$