Need n squares that equal one square all together, none zero, none fractured.
For example, calling squares(2) should output [16 9] or [25 144] etc, because
16=4*4, 9=3*3, and 16+9=5*5, similarly 25=5*5, 144=12*12, and 25+144=13*13.
Return a list sorted by number of occurrences
Count from 0 to N^M in base N.
2 b | ~ 2 b
Number of 1s in a binary string
Number of Horns on a unicorn!
count any radix?
speed vs size
swap sign sum & multiply castles
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