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 A102738 #18 May 03 2024 15:42:01 %S A102738 1,2,3,4,5,15,35,61,256,357,628,767,1064,1096,6608,14821,15341,18795, %T A102738 22648,24199,31919,38519,44279 %N A102738 Numbers k such that 4*10^k - 11 is prime. %C A102738 Numbers corresponding to terms <= 767 are certified primes. - _Klaus Brockhaus_, Feb 16 2005 %C A102738 The next term is larger than 2500. - _Stefan Steinerberger_, Feb 18 2006 %t A102738 For[n=1, n<2500,n++,If[PrimeQ[4*10^n-11], Print[n]]] (* _Stefan Steinerberger_, Feb 18 2006 *) %o A102738 (PARI) is(n)=ispseudoprime(4*10^n-11) \\ _Charles R Greathouse IV_, Jun 13 2017 %K A102738 more,nonn %O A102738 1,2 %A A102738 Tom Mueller (muel4503(AT)uni-trier.de), Feb 08 2005 %E A102738 a(9)-a(14) from _Klaus Brockhaus_, Feb 16 2005 %E A102738 a(15) from _Ryan Propper_, Jul 21 2006 %E A102738 a(16)-a(17) from _Michael S. Branicky_, May 01 2023 %E A102738 a(18)-a(23) from Kamada data by _Tyler Busby_, May 03 2024