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 A378832 #19 Mar 28 2025 18:21:47 %S A378832 1,3,7,133,331,453,10365 %N A378832 Numbers k such that 5^k + 68 is prime. %C A378832 a(8) > 22000. - _Matthew L. LaSelle_, Feb 25 2025 %C A378832 a(8) > 100000. - _Michael S. Branicky_, Mar 28 2025 %e A378832 3 is a term because 5^3 + 68 = 193 is prime. %t A378832 Select[Range[0,5000],PrimeQ[5^#+68]&] %o A378832 (Magma) [k: k in [0..1000] |IsPrime (5^k+68)]; %Y A378832 Cf. A089142, A124621, A217133. %K A378832 nonn,hard,more %O A378832 1,2 %A A378832 _Robert Price_, Dec 08 2024 %E A378832 a(7) from _Michael S. Branicky_, Dec 17 2024