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 A126896 #30 Apr 16 2025 04:58:37 %S A126896 0,1,3,4,5,23,32,39,61,349,718,805,1025,1194,1550,1774,3417,7583 %N A126896 Numbers k such that 10*k! + 1 is prime. %C A126896 a(17) > 2880. - _Jinyuan Wang_, Feb 05 2020 %C A126896 a(19) > 12000. - _Michael S. Branicky_, Jul 07 2024 %e A126896 k = 4 is a term because 10*4! + 1 = 241 is prime. %o A126896 (PARI) is(k) = ispseudoprime(10*k!+1); \\ _Jinyuan Wang_, Feb 05 2020 %Y A126896 Corresponding primes are in A089764. %Y A126896 Cf. A002981, A051915, A076679, A076680, A076681, A076682, A076683, A178488, A180626. %K A126896 nonn,more %O A126896 1,3 %A A126896 _Parthasarathy Nambi_, May 07 2007 %E A126896 a(15)-a(16) from _Jinyuan Wang_, Feb 05 2020 %E A126896 a(17) from _Michael S. Branicky_, Apr 16 2023 %E A126896 a(18) from _Michael S. Branicky_, Jul 07 2024