Question 1028994
17 squared is	289
18 squared is	324
19 squared is	361
20 squared is	400
21 squared is	441
22 squared is	484
23 squared is	529
24 squared is	576
25 squared is	625
26 squared is	676
27 squared is	729
28 squared is	784
29 squared is	841

The answer is 841, the square of 29. Brute force method, just list them out.