The term nth in math means some item in a sequence; n stands for number, so if you have a sequence with a first, second, third, fourth, fifth, sixth (etc) item, you can also talk about the nth item, which is some item at some unspecified location in this sequence.
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nth. This refers to a number raised to an undefined power. "Consider x to the nth power."
If you mean: 3, 4, 5, 6 and 7 then nth term = n+2
You must mean what is the next number in the series, not the 'nth', which is undefined. The next number is 58.
Good Question! After 6 years of math classes in college, and 30+ years of teaching (during which I took many summer classes) I've never seen an explicit formula for the nth term of the Fibonacci sequence. Study more math and maybe you can discover the explicit formula that you want.
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