UTSL.  avr-libc&#x27;s random is <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Lehmer_random_number_generator" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Lehmer_random_number_generator</a> with n = 2^31-1, g = 7^5.  It&#x27;s not great, but it&#x27;s not so bad that it wasn&#x27;t standardized as a generator in C++11 (std::minstd_rand0), though with an alternate value for g.  I didn&#x27;t determine whether Arduino replaces this with an alternate implementation.<p>notably, out of the range of uint32_t, it&#x27;ll never produce the outputs 0 or 2^31-1