10, 13, 234, 681, 997

Solution

The pattern is that the sum of digits of the numbers is a perfect square.

10 => 1 + 0 = 1

13 => 1 + 3 = 4

234 => 2 + 3 + 4 = 9

681 => 6 + 8 + 1 = 15

997 => 9 + 9 + 7 = 25

=> Ans - (D)

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