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  <title>Automorphic — modulus</title>
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  <h1>Single automorphic check</h1>
  <p>Edit <code>number</code> in the script, then click <strong>Run</strong>.</p>
  <pre id=out></pre>
  <script>!function(){var n=function(n){if(n<=0)return!1;var t=function(n){for(var t=0,r=n;r>0;)t++,r=r/10|0;return t}(n),r=BigInt(n);return r*r%function(n){for(var t=BigInt(1),r=0;r<n;r++)t*=BigInt(10);return t}(t)===r}(76)?"76 is an automorphic number.":"76 is not an automorphic number.";document.getElementById("out").textContent=n}()</script>
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JavaScript Automorphic — Modulus (Try It)