Euler has design of a homepage and there is a link back to the overview for each solution.

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-<h1 id="Euler-Problem-35">Euler Problem 35<a class="anchor-link" href="#Euler-Problem-35">&#182;</a></h1><p>The number, 197, is called a circular prime because all rotations of the digits: 197, 971, and 719, are themselves prime.</p>
+<h1 id="Euler-Problem-35">Euler Problem 35<a class="anchor-link" href="#Euler-Problem-35">¶</a></h1><p><a href="/euler">Back to overview.</a></p><p>The number, 197, is called a circular prime because all rotations of the digits: 197, 971, and 719, are themselves prime.</p>
 <p>There are thirteen such primes below 100: 2, 3, 5, 7, 11, 13, 17, 31, 37, 71, 73, 79, and 97.</p>
 <p>How many circular primes are there below one million?</p>
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 <p>First we get all primes into a look-up table. Then we iterate them and check whether they are circular.</p>
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 <div class=" highlight hl-ipython3"><pre><span></span><span class="k">def</span> <span class="nf">get_primes_smaller</span><span class="p">(</span><span class="n">number</span><span class="p">):</span>
    <span class="n">primes</span> <span class="o">=</span> <span class="p">[]</span>
    <span class="n">prospects</span> <span class="o">=</span> <span class="p">[</span><span class="n">n</span> <span class="k">for</span> <span class="n">n</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="n">number</span><span class="p">)]</span>
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 <span class="n">ps</span> <span class="o">=</span> <span class="n">get_primes_smaller</span><span class="p">(</span><span class="mi">1000000</span><span class="p">)</span>
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 <div class=" highlight hl-ipython3"><pre><span></span><span class="k">def</span> <span class="nf">get_combinations</span><span class="p">(</span><span class="n">xs</span><span class="p">):</span>
    <span class="k">if</span> <span class="ow">not</span> <span class="n">xs</span><span class="p">:</span>
        <span class="k">return</span> <span class="p">[]</span>
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            <span class="n">rs</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">xs</span><span class="p">[</span><span class="n">i</span><span class="p">]</span> <span class="o">+</span> <span class="n">ys</span><span class="p">)</span>
    <span class="k">return</span> <span class="n">rs</span>

-<span class="k">assert</span><span class="p">(</span><span class="n">get_combinations</span><span class="p">(</span><span class="s2">&quot;ab&quot;</span><span class="p">)</span> <span class="o">==</span> <span class="p">[</span><span class="s2">&quot;ab&quot;</span><span class="p">,</span> <span class="s2">&quot;ba&quot;</span><span class="p">])</span>
+<span class="k">assert</span><span class="p">(</span><span class="n">get_combinations</span><span class="p">(</span><span class="s2">"ab"</span><span class="p">)</span> <span class="o">==</span> <span class="p">[</span><span class="s2">"ab"</span><span class="p">,</span> <span class="s2">"ba"</span><span class="p">])</span>
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 <div class=" highlight hl-ipython3"><pre><span></span><span class="kn">from</span> <span class="nn">itertools</span> <span class="k">import</span> <span class="n">permutations</span>
 <span class="n">prime_set</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="n">ps</span><span class="p">)</span>

 <span class="k">def</span> <span class="nf">is_circular</span><span class="p">(</span><span class="n">p</span><span class="p">):</span>
    <span class="n">cs</span> <span class="o">=</span> <span class="n">permutations</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">p</span><span class="p">))</span>
    <span class="k">for</span> <span class="n">c</span> <span class="ow">in</span> <span class="n">cs</span><span class="p">:</span>
-        <span class="k">if</span> <span class="ow">not</span> <span class="nb">int</span><span class="p">(</span><span class="s2">&quot;&quot;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">c</span><span class="p">))</span> <span class="ow">in</span> <span class="n">prime_set</span><span class="p">:</span>
+        <span class="k">if</span> <span class="ow">not</span> <span class="nb">int</span><span class="p">(</span><span class="s2">""</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">c</span><span class="p">))</span> <span class="ow">in</span> <span class="n">prime_set</span><span class="p">:</span>
            <span class="k">return</span> <span class="kc">False</span>
    <span class="k">return</span> <span class="kc">True</span>

-<span class="k">assert</span><span class="p">(</span><span class="n">is_circular</span><span class="p">(</span><span class="s2">&quot;2&quot;</span><span class="p">)</span> <span class="o">==</span> <span class="kc">True</span><span class="p">)</span>
-<span class="k">assert</span><span class="p">(</span><span class="n">is_circular</span><span class="p">(</span><span class="s2">&quot;11&quot;</span><span class="p">)</span> <span class="o">==</span> <span class="kc">True</span><span class="p">)</span>
-<span class="k">assert</span><span class="p">(</span><span class="n">is_circular</span><span class="p">(</span><span class="s2">&quot;47&quot;</span><span class="p">)</span> <span class="o">==</span> <span class="kc">False</span><span class="p">)</span>
+<span class="k">assert</span><span class="p">(</span><span class="n">is_circular</span><span class="p">(</span><span class="s2">"2"</span><span class="p">)</span> <span class="o">==</span> <span class="kc">True</span><span class="p">)</span>
+<span class="k">assert</span><span class="p">(</span><span class="n">is_circular</span><span class="p">(</span><span class="s2">"11"</span><span class="p">)</span> <span class="o">==</span> <span class="kc">True</span><span class="p">)</span>
+<span class="k">assert</span><span class="p">(</span><span class="n">is_circular</span><span class="p">(</span><span class="s2">"47"</span><span class="p">)</span> <span class="o">==</span> <span class="kc">False</span><span class="p">)</span>
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 <div class=" highlight hl-ipython3"><pre><span></span><span class="n">s</span> <span class="o">=</span> <span class="nb">len</span><span class="p">([</span><span class="n">p</span> <span class="k">for</span> <span class="n">p</span> <span class="ow">in</span> <span class="n">ps</span> <span class="k">if</span> <span class="n">is_circular</span><span class="p">(</span><span class="n">p</span><span class="p">)])</span>
-<span class="nb">print</span><span class="p">(</span><span class="s2">&quot;False solution </span><span class="si">{}</span><span class="s2">&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">s</span><span class="p">))</span>
+<span class="nb">print</span><span class="p">(</span><span class="s2">"False solution </span><span class="si">{}</span><span class="s2">"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">s</span><span class="p">))</span>
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 <pre>False solution 22
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 <p>We did not read the problem properly. Cycles are obviously not the same as permutations. If we change that we should  get the solution in no time.</p>
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 <div class=" highlight hl-ipython3"><pre><span></span><span class="k">def</span> <span class="nf">cyles</span><span class="p">(</span><span class="n">xs</span><span class="p">):</span>
    <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">xs</span><span class="p">)</span> <span class="o">&lt;=</span> <span class="mi">1</span><span class="p">:</span>
        <span class="k">return</span> <span class="n">xs</span>
@@ -11921,55 +11898,37 @@ div#notebook {
 <span class="k">def</span> <span class="nf">is_circular</span><span class="p">(</span><span class="n">p</span><span class="p">):</span>
    <span class="n">cs</span> <span class="o">=</span> <span class="n">cyles</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">p</span><span class="p">))</span>
    <span class="k">for</span> <span class="n">c</span> <span class="ow">in</span> <span class="n">cs</span><span class="p">:</span>
-        <span class="k">if</span> <span class="ow">not</span> <span class="nb">int</span><span class="p">(</span><span class="s2">&quot;&quot;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">c</span><span class="p">))</span> <span class="ow">in</span> <span class="n">prime_set</span><span class="p">:</span>
+        <span class="k">if</span> <span class="ow">not</span> <span class="nb">int</span><span class="p">(</span><span class="s2">""</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">c</span><span class="p">))</span> <span class="ow">in</span> <span class="n">prime_set</span><span class="p">:</span>
            <span class="k">return</span> <span class="kc">False</span>
    <span class="k">return</span> <span class="kc">True</span>
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 <div class=" highlight hl-ipython3"><pre><span></span><span class="n">s</span> <span class="o">=</span> <span class="nb">len</span><span class="p">([</span><span class="n">p</span> <span class="k">for</span> <span class="n">p</span> <span class="ow">in</span> <span class="n">ps</span> <span class="k">if</span> <span class="n">is_circular</span><span class="p">(</span><span class="n">p</span><span class="p">)])</span>
 <span class="n">s</span>
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 <pre>55</pre>
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