There are 14 such numbers: 10, 13, 18, 22, 27, 31, 36, 40, 45, 54, 63, 72, 79, 81
10,13,18,22,27,31,36,40,45,54,63,72, 79, and 81 for a total of 14 numbers
There are 14 such numbers.
11 squared is 121
None, although "perfect square" tends to be used for whole numbers.
There are none.
1
None. √1976 is "44 and a bit" → first perfect square ≥ 1976 is 452 = 2025 As 1976 is not a perfect square and the first perfect square greater than 1976 is 2025, and 2025 is greater than 2013, there are no perfect squares from 1976 to 2013.
There are 17 such numbers.
16 of them.
18
14
17 of them. 17 of them. 17 of them. 17 of them.
69
The sum of the digits in '89' is 17, so I don't need toworry about any perfect square bigger than 16.1: 104: 13, 22, 31, 409: 18, 27, 36, 45, 54, 63, 72, 8116: 79That's 14 of them .
If the number with the digits reversed can have a leading 0 so that it is a 1-digit number, then 16. Otherwise 13.
121.
the highest sum of the numbers is 17 and the lowest is 1. The only perfect squares in that range are 1,4,9, and 16. That means the following numbers will work: 10,13.18,22,27,31,36,40,45,54,63,72,79,81,88, and 90; that is 16 numbers
8362 = 698896
No. Square numbers (or perfect square numbers) are squares of integers. The perfect square numbers are 1, 4, 9, 16, 25, 36 ... 20 is not in the series.