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Bunuel
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Hi,

I am just wondering how we know that -5 is the 81st term. we cannot obviously check it manually is there any way to know that?
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Maria20
Hi,

I am just wondering how we know that -5 is the 81st term. we cannot obviously check it manually is there any way to know that?

Maria20

What would be the 6th term?
How about the 9th?
How about the 12th?
15th?
Etc.?
How about any term that is a multiple of 3?
81 is a multiple of 3.
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