tn = 2x2 + 3 where x = 1, 2, 3, ...
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10n + 1
It is: 27-2n
The nth term of the sequence 2n + 1 is calculated by substituting n with the term number. So, the tenth term would be 2(10) + 1 = 20 + 1 = 21. Therefore, the tenth term of the sequence 2n + 1 is 21.
A single number, such as 1521273339 does not define a sequence. There is no nth term for a signle number.
It is 5n-4 and so the next term will be 21