There does not appear to be a missing number. The sequence is n2 + 1.
12 + 1 = 2 : 22 + 1 = 5 : 52 + 1 = 26 : 262 + 1 = 677.
The next number in the sequence is 6772 + 1 = 458330.
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If you fit the following cubic t(n) = (-n3 + 9n2 - 20n + 18)/3 where n = 1, 2, 3, ... then the next number is t(6) = 1
The missing number is 26. The number after 29 is 58.
Number missing (dividend) divided by 5 (divisor)= quotient need 2 of 3 numbers to solve for missing number
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