The square of a few plus 73 equals the square of a few
According to the meaning of the title
a² + 73 = b²
b² - a² = 73
(b+a)(b-a)=73
73 is prime, only 73 × 1 = 73
therefore
b+a=73
b-a=1
The solution is b = 37, a = 36
therefore
36² + 73 = 37²
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