Added problems till 60 to ipynb.

ipython/EulerProblem058.ipynb

@@ -0,0 +1,66 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Spiral primes (Euler Problem 58)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "collapsed": true
+   },
+   "source": [
+    "[https://projecteuler.net/problem=58](https://projecteuler.net/problem=58)\n",
+    "\n",
+    "Starting with 1 and spiralling anticlockwise in the following way, a square spiral with side length 7 is formed.\n",
+    "\n",
+    "37 36 35 34 33 32 31\n",
+    "38 17 16 15 14 13 30\n",
+    "39 18  5  4  3 12 29\n",
+    "40 19  6  1  2 11 28\n",
+    "41 20  7  8  9 10 27\n",
+    "42 21 22 23 24 25 26\n",
+    "43 44 45 46 47 48 49\n",
+    "\n",
+    "It is interesting to note that the odd squares lie along the bottom right diagonal, but what is more interesting is that 8 out of the 13 numbers lying along both diagonals are prime; that is, a ratio of 8/13 ≈ 62%.\n",
+    "\n",
+    "If one complete new layer is wrapped around the spiral above, a square spiral with side length 9 will be formed. If this process is continued, what is the side length of the square spiral for which the ratio of primes along both diagonals first falls below 10%?"
+   ]
+  },
+  {
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+   "execution_count": null,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
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+   "name": "python3"
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+  "tags": []
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+}