5 lines
133 B
APL
5 lines
133 B
APL
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⍝ s = 520 + 2 ... + 2 ⍣ <= power
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⍝ s × s = n × 1000000 + 269696 | <= remainder
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2+⍣{269696=1000000|⍺×⍺}520
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