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May 20th, 2018
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  1. pSum(a1, d, lim) =
  2. let n1 = (lim `div` d)
  3. n2 = ((lim - a1) `div` d + 1)
  4. in if (a1 == d)
  5. then (d * n1 * (n1 + 1)) `div` 2
  6. else (n2 `div` 2) * (a1 + aN(a1, d, n2))
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