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 A246603 #13 Oct 19 2017 10:46:17 %S A246603 1,1,7,37,37,37,37,1423,10987,13297,219277,219277,669463,2215987, %T A246603 7841563,33376753,54444163,112545673,267625087,1676296087,2772262903, %U A246603 2782012963,4341199657,34694683237,39965586763,232265913427,1879768081657,1879768081657 %N A246603 -a(n) is the greatest negative primitive root that all of the first n primes share. %D A246603 _Don Reble_, Posting to Sequence Fans Mailing List, Sep 07 2014 %Y A246603 Cf. A002199, A128895. %K A246603 nonn %O A246603 1,3 %A A246603 _N. J. A. Sloane_, Sep 09 2014