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 A268065 #25 Dec 01 2024 15:53:49 %S A268065 0,1,3,7,19,33,1363,6663 %N A268065 Integers k such that 2^k + 3^k + 5^k + k is prime. %C A268065 a(8), if it exists, is greater than 30000. - _Vaclav Kotesovec_, Jan 26 2016 %C A268065 a(8), if it exists, is greater than 100000. - _Michael S. Branicky_, Dec 01 2024 %e A268065 k=3: 2^3+3^3+5^3+3 = 163. %t A268065 Select[Range[0, 2000], PrimeQ[2^# + 3^# + 5^# + #] &] (* _Vaclav Kotesovec_, Jan 25 2016 *) %o A268065 (PARI) lista(nn) = for(n=0, nn, if(ispseudoprime(2^n + 3^n + 5^n + n), print1(n, ", "))); \\ _Altug Alkan_, Jan 25 2016 %Y A268065 Cf. A076515, A268067. %K A268065 nonn,more %O A268065 1,3 %A A268065 _Emre APARI_, Jan 25 2016 %E A268065 a(7) from _Vaclav Kotesovec_, Jan 25 2016