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 A143279 #11 Jun 06 2017 14:27:12 %S A143279 0,1,2,3,23,27,33,63,158,278,290,351,471,797,8462,28793,266030 %N A143279 Numbers n such that 6*5^n + 1 is prime. %C A143279 Primes found and proved by PrimeForm. %C A143279 All terms correspond to verified primes, that is, not merely probable primes. - _Robert Price_, Jan 16 2015 %C A143279 a(18) > 3*10^5. - _Robert Price_, Jan 16 2015 %t A143279 Select[Range[0, 10000], PrimeQ[6*5^# + 1] &] (* _Robert Price_, Jan 16 2015 *) %o A143279 (PARI) is(n)=ispseudoprime(6*5^n+1) \\ _Charles R Greathouse IV_, Jun 06 2017 %K A143279 hard,nonn %O A143279 1,3 %A A143279 _Rick L. Shepherd_, Aug 04 2008 %E A143279 a(17) from _Robert Price_, Jan 16 2015