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 A102739 #12 Jul 12 2023 13:33:10 %S A102739 9,15,21,44,58,64,96,108,138,160,222,534,2060,2446,3884,8794,9879, %T A102739 18303 %N A102739 Numbers k such that 6*10^k-11 is prime. %C A102739 Some of the larger entries may only correspond to probable primes. %C A102739 Numbers corresponding to terms <= 534 are certified primes. - _Klaus Brockhaus_, Feb 16 2005 %o A102739 (PARI) is(n)=ispseudoprime(6*10^n-11) \\ _Charles R Greathouse IV_, Jun 13 2017 %K A102739 nonn,more %O A102739 1,1 %A A102739 Tom Mueller (muel4503(AT)uni-trier.de), Feb 08 2005 %E A102739 a(12)-a(14) from _Klaus Brockhaus_, Feb 16 2005 %E A102739 a(15)-a(18) from _Michael S. Branicky_, Jul 12 2023