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 A053608 #10 Aug 23 2024 08:42:00 %S A053608 1,2,6,420,360360,718766754945489455304472257065075294400 %N A053608 Numbers x = LCM(1,2,...,k) such that x^2 + 1 is prime. %C A053608 The next term has k > 10^4, if it exists. - _Amiram Eldar_, Aug 23 2024 %t A053608 Select[FoldList[LCM, 1, Select[Range[100], PrimePowerQ]], PrimeQ[#^2 + 1] &] (* _Amiram Eldar_, Aug 23 2024 *) %Y A053608 Cf. A003418, A049536, A046029, A051418, A051451, A051739, A053609. %K A053608 nonn,hard %O A053608 1,2 %A A053608 _Labos Elemer_, Feb 09 2000