1=13-0
7=23-1
25=33-2
61=43-3
121=53-4
so the next number must be 63-5=216-5=211
In general the nth term, an =n3-(n-1)
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49, 36, 25...
121: ± 11625: ± 25
Find by using the differences of the differences of the numbers.
289 because each consecutive prime number is squared.
There appears to be no discernible pattern for these numbers, other than them increasing in arbitrary multiples of 6.