A string number: 5, 10, 17, 26 The nth number is represented by an algebraic expression containing n

5=1+1+3
10=1+1+3+5
17=1+1+3+5+7
.
The nth number: 1 + 1 + 3 + 5 +... + (2n + 1) = (n + 1) ^ 2 + 1 (arithmetic sequence summation formula)

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