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 A078744 #16 Aug 10 2024 09:29:12 %S A078744 1,4,6,7,8,13,17,18,21,41,86,101,144,368,1232,1713,2431,2897,6122, %T A078744 6240,6876 %N A078744 Numbers k such that A049614(k) + A000040(k) is prime. %o A078744 (PARI) is(k) = ispseudoprime(prod(i=1, k, i^!isprime(i)) + prime(k)); \\ _Jinyuan Wang_, Jan 08 2021 %Y A078744 Cf. A000040, A034386, A049614, A078745. %K A078744 nonn,more %O A078744 1,2 %A A078744 _Jason Earls_, Dec 21 2002 %E A078744 a(17)-a(18) from _Jinyuan Wang_, Jan 08 2021 %E A078744 a(19)-a(21) from _Michael S. Branicky_, Aug 10 2024