R←PESIX;⎕IO ⎕IO←1⍝ Difference between the sum of the squares of the first

⍝ 100 natural numbers and the square of the sum of the same.R←((+/⍳100)*2)-+/(⍳100)*2

# APL Hacking: Project Euler Daily (#6)

This one was too easy, I probably am doing it wrong.