Basically the nth number is any possible number in the world!! Generally if you come across a question like this there will be more to it.
For example:
In the sequence 2, 4, 6, 8, 10.... what is the nth term?
This means that they want a general formula for each term. So if x is the term number, the nth term would be 2x.
That's all the information I can give you, I'm sure someone else might be able to help a little more :)
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The nth triangulat number is n*(n+1)/2 The 100th is 100*101/2 = 5050
The nth even number is 2n...
The nth triangulat number is n*(n+1)/2. So, the 61st is 61*62/2 = 1891
The Nth term for a triangle number is: 0.5n(n+1)
Given ANY number at all, it is possible to find a cubic polynomial such that that particular number is the nth number in a sequence starting with the above three. The simplest rule, however, is Un = 5n + 9