Did Euler 37.

ipython/EulerProblem036.ipynb

@@ -0,0 +1,112 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Euler Problem 36\n",
+    "\n",
+    "The decimal number, 585 = $1001001001_2$ (binary), is palindromic in both bases.\n",
+    "\n",
+    "Find the sum of all numbers, less than one million, which are palindromic in base 10 and base 2.\n",
+    "\n",
+    "(Please note that the palindromic number, in either base, may not include leading zeros.)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "This looks like an easy problem to me. Like really easy. Should we try to brute force first?"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [],
+   "source": [
+    "def is_palindrome_decimal(n):\n",
+    "    return str(n) == str(n)[::-1]\n",
+    "\n",
+    "assert(is_palindrome_decimal(232) == True)\n",
+    "assert(is_palindrome_decimal(2) == True)\n",
+    "assert(is_palindrome_decimal(2322) == False)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [],
+   "source": [
+    "def is_palindrome_binary(n):\n",
+    "    s = str(bin(n)[2:])\n",
+    "    return s == s[::-1]\n",
+    "\n",
+    "assert(is_palindrome_binary(585) == True)\n",
+    "assert(is_palindrome_binary(3) == True)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "s = sum([i for i in range(1000000) if is_palindrome_decimal(i) and is_palindrome_binary(i)])"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "872187\n"
+     ]
+    }
+   ],
+   "source": [
+    "print(s)"
+   ]
+  }
+ ],
+ "metadata": {
+  "completion_date": "Fri, 11 May 2018, 02:38",
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.5.5"
+  },
+  "tags": [
+   "palindrome",
+   "brute force"
+  ]
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}

ipython/EulerProblem037.ipynb

@@ -0,0 +1,32 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Euler Problem 37"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.5.5"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}