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 A364242 #18 Aug 14 2023 16:29:40 %S A364242 3,33,663,18445,887313,84946015,3086525013,557027507463, %T A364242 31110090768183,3404401335645583,609352762511672905 %N A364242 a(n) is the smallest positive integer such that a(n) and a(n)+2 are both products of n distinct prime factors. %e A364242 a(2) = 33 = 3 * 11, a(2) + 2 = 35 = 5 * 7. %e A364242 a(3) = 663 = 3 * 13 * 17, a(3) + 2 = 665 = 5 * 7 * 19. %o A364242 (PARI) isok(k, n) = (omega(k)==n) && (omega(k+2)==n) && issquarefree(k) && issquarefree(k+2) %o A364242 a(n) = my(k=1); while (!isok(k, n), k++); k; \\ _Michel Marcus_, Jul 16 2023 %Y A364242 Cf. A052215. %Y A364242 Subsequence of A005117. %K A364242 nonn,hard,more %O A364242 1,1 %A A364242 _Tomek Czajka_, Jul 15 2023