euler44.ipynb

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  10     {
  11      "data": {
  12       "text/plain": [
  13        ":pentagonal"
  14       ]
  15      },
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  21    "source": [
  22     "def pentagonal(n)\n",
  23     "  n * (3 * n - 1) / 2\n",
  24     "end"
  25    ]
  26   },
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