The first 15 square numbers are 1, 4, 9, 25, 36, 49, 64, 81, 100, 121, 144, 169, 196, 225.
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1,4,9,25,36,49,64,81,100,121,144,169,196,225
3.14159265358979
15 and 30
To any set that contains it! It belongs to {-15}, or {sqrt(2), -15, pi, -3/7}, or all whole numbers between -43 and 53, or multiples of 5, or composite numbers, or integers, or rational numbers, or real numbers, or complex numbers, etc.
15 + 1 = 16, and 15 - 1 = 14, so the two numbers are 15 and 1.