This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A033984 #23 Sep 22 2016 16:45:46 %S A033984 1,7,40369,673663,990409,1697609,2073127,6462649,7527199,7559479, %T A033984 14421169,21484129,37825753,57233047,130647919,141735559,179203369, %U A033984 188967289,218206489,259195009,264538057,277628449,330662479,398321239,501126487 %N A033984 Odd integers n such that 2^n == 16 (mod n). %C A033984 The odd terms of A015924. %C A033984 For all m, 2^A128121(m)-1 belongs to this sequence. %H A033984 Max Alekseyev, <a href="/A033984/b033984.txt">Table of n, a(n) for n = 1..790</a> (all terms below 10^14) %t A033984 Select[Range[1,510000001,2],PowerMod[2,#,#]==16&] (* _Harvey P. Dale_, Dec 11 2010 *) %Y A033984 Besides initial terms, the sequence coincides with A173138. %Y A033984 Cf. A015924, A173138, A173572. %K A033984 nonn %O A033984 1,2 %A A033984 Joe K. Crump (joecr(AT)carolina.rr.com) %E A033984 Edited and terms 1,7 prepended by _Max Alekseyev_, Aug 09 2012