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-33">Euler Problem 33<a class="anchor-link" href="#Euler-Problem-33">&#182;</a></h1><p>The fraction 49/98 is a curious fraction, as an inexperienced mathematician in attempting to simplify it may incorrectly believe that 49/98 = 4/8, which is correct, is obtained by cancelling the 9s.</p>
+<h1 id="Euler-Problem-33">Euler Problem 33<a class="anchor-link" href="#Euler-Problem-33">¶</a></h1><p><a href="/euler">Back to overview.</a></p><p>The fraction 49/98 is a curious fraction, as an inexperienced mathematician in attempting to simplify it may incorrectly believe that 49/98 = 4/8, which is correct, is obtained by cancelling the 9s.</p>
 <p>We shall consider fractions like, 30/50 = 3/5, to be trivial examples.</p>
 <p>There are exactly four non-trivial examples of this type of fraction, less than one in value, and containing two digits in the numerator and denominator.</p>
 <p>If the product of these four fractions is given in its lowest common terms, find the value of the denominator.</p>
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 <p>We start write a function which checks if a number is curios and then brute force.</p>
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 <div class=" highlight hl-ipython3"><pre><span></span><span class="k">def</span> <span class="nf">is_curious</span><span class="p">(</span><span class="n">n</span><span class="p">,</span> <span class="n">d</span><span class="p">):</span>
    <span class="k">assert</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">n</span><span class="p">))</span> <span class="o">==</span> <span class="mi">2</span> <span class="ow">and</span> <span class="nb">len</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">d</span><span class="p">))</span> <span class="o">==</span> <span class="mi">2</span><span class="p">)</span>
    <span class="k">if</span> <span class="n">n</span> <span class="o">==</span> <span class="n">d</span><span class="p">:</span>
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        <span class="k">if</span> <span class="nb">str</span><span class="p">(</span><span class="n">i</span><span class="p">)</span> <span class="ow">in</span> <span class="nb">str</span><span class="p">(</span><span class="n">n</span><span class="p">)</span> <span class="ow">and</span> <span class="nb">str</span><span class="p">(</span><span class="n">i</span><span class="p">)</span> <span class="ow">in</span> <span class="nb">str</span><span class="p">(</span><span class="n">d</span><span class="p">):</span>
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-                <span class="n">n_</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">n</span><span class="p">)</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">i</span><span class="p">),</span> <span class="s2">&quot;&quot;</span><span class="p">))</span>
-                <span class="n">d_</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">d</span><span class="p">)</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">i</span><span class="p">),</span> <span class="s2">&quot;&quot;</span><span class="p">))</span>
+                <span class="n">n_</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">n</span><span class="p">)</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">i</span><span class="p">),</span> <span class="s2">""</span><span class="p">))</span>
+                <span class="n">d_</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">d</span><span class="p">)</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">i</span><span class="p">),</span> <span class="s2">""</span><span class="p">))</span>
            <span class="k">except</span> <span class="ne">ValueError</span><span class="p">:</span>
                <span class="k">return</span> <span class="kc">False</span>
            <span class="k">try</span><span class="p">:</span>
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 <span class="k">assert</span><span class="p">(</span><span class="n">is_curious</span><span class="p">(</span><span class="mi">49</span><span class="p">,</span> <span class="mi">98</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_curious</span><span class="p">(</span><span class="mi">30</span><span class="p">,</span> <span class="mi">50</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">fs</span> <span class="o">=</span> <span class="p">[(</span><span class="n">n</span><span class="p">,</span> <span class="n">d</span><span class="p">)</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">10</span><span class="p">,</span> <span class="mi">100</span><span class="p">)</span> <span class="k">for</span> <span class="n">d</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="n">n</span><span class="p">,</span> <span class="mi">100</span><span class="p">)</span> <span class="k">if</span> <span class="n">is_curious</span><span class="p">(</span><span class="n">n</span><span class="p">,</span> <span class="n">d</span><span class="p">)]</span>
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 <pre>[(16, 64), (19, 95), (26, 65), (49, 98)]</pre>
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 <div class=" highlight hl-ipython3"><pre><span></span><span class="n">n</span> <span class="o">=</span> <span class="mi">1</span>
 <span class="n">d</span> <span class="o">=</span> <span class="mi">1</span>
 <span class="k">for</span> <span class="n">n_</span><span class="p">,</span> <span class="n">d_</span> <span class="ow">in</span> <span class="n">fs</span><span class="p">:</span>
    <span class="n">n</span> <span class="o">*=</span> <span class="n">n_</span>
    <span class="n">d</span> <span class="o">*=</span> <span class="n">d_</span>

-<span class="nb">print</span><span class="p">(</span><span class="s2">&quot;</span><span class="si">{}</span><span class="s2">/</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">n</span><span class="p">,</span> <span class="n">d</span><span class="p">))</span>
+<span class="nb">print</span><span class="p">(</span><span class="s2">"</span><span class="si">{}</span><span class="s2">/</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">n</span><span class="p">,</span> <span class="n">d</span><span class="p">))</span>
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 <pre>387296/38729600
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 <p>Now we can see that the solution is $100$. But actually it would be nice to calculate the GCD.</p>
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 <div class=" highlight hl-ipython3"><pre><span></span><span class="k">def</span> <span class="nf">gcd_euclid</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">):</span>
    <span class="k">if</span> <span class="n">a</span> <span class="o">==</span> <span class="n">b</span><span class="p">:</span>
        <span class="k">return</span> <span class="n">a</span>
@@ -11923,37 +11892,21 @@ div#notebook {
 <span class="k">assert</span><span class="p">(</span><span class="n">s</span> <span class="o">==</span> <span class="mi">100</span><span class="p">)</span>
 <span class="n">s</span>
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 <pre>100</pre>
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