aₙ = 4n - 5
a₁ = 4 * 1 - 5 = - 1
a₈ = 4 * 8 - 5 = 32 - 5 = 27
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aₙ = 4n - 5
a₁ = 4 * 1 - 5 = - 1
a₈ = 4 * 8 - 5 = 32 - 5 = 27