 <p>Since you are on <strong><em>UNIX</em></strong>, you can use <code>jot</code> with arguments from bash integer expansion:</p> <pre><code>jot -r 1 $((10 ** 15)) $((((10 ** 15)) * 2)) </code></pre> <p>Generates numbers like:</p> <pre><code>1595866171875968 </code></pre>