Sn = 1
Sn = S(n-1)+12*(n-1), where S-0 (the first term) = 1
*This only works for stellar numbers of base 6
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There is no formula for prime numbers. They form a random sequence.
No, it will be a formula, because "the nth term" means that you have not defined exactly which term it is. So, you make a formula which works for ANY term in the sequence.
At least two or more numbers are needed to work out the nth term
It is: nth term = 35-9n
(n^2+n)/2