21, _, _, _, _,
An⁵=A1(r n-1)
An⁵=21(3 5-1)
An⁵=21(3⁴)= 21(81)
An⁵=1,701
21, 63, 189, 1,701..
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21, _, _, _, _,
An⁵=A1(r n-1)
An⁵=21(3 5-1)
An⁵=21(3⁴)= 21(81)
An⁵=1,701
21, 63, 189, 1,701..