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 A186630 #22 Apr 03 2023 10:36:12 %S A186630 1,2,10,12,30,48,373,580,619,718,1592,2928,3076,4741,9198,14020 %N A186630 Numbers n>0 such that 666*10^n+1 is prime. %C A186630 No other terms below 10^5. [_Arkadiusz Wesolowski_, Dec 23 2011] %H A186630 Chris Caldwell, The Prime Glossary, <a href="https://t5k.org/glossary/xpage/BeastlyPrime.html">Beastly prime</a> %H A186630 G. L. Honaker, Jr. and Chris Caldwell, <a href="https://t5k.org/curios/cpage/21327.html">Prime Curios! 66601</a> %H A186630 R. Ondrejka, <a href="http://www.utm.edu/research/primes/lists/top_ten/">The Top Ten: a Catalogue of Primal Configurations</a> (May 2001), p. 83 %t A186630 Select[Range[10^3], PrimeQ[666*10^# + 1] &] (* _Arkadiusz Wesolowski_, Sep 08 2011 *) %Y A186630 Cf. A186086. %K A186630 nonn,base,more %O A186630 1,2 %A A186630 _Arkadiusz Wesolowski_, Feb 24 2011 %E A186630 a(16) (discovered on Dec 09 1999, by Nuutti Kuosa) added by _Arkadiusz Wesolowski_, Mar 16 2011