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 A273599 #12 Nov 11 2024 14:18:04 %S A273599 5,19,67,107,593,757,1801,2243,2383,6043,10181,11383,15629 %N A273599 Numbers k such that (11^k - 7^k)/4 is prime. %C A273599 All terms are prime. %C A273599 The corresponding primes: 36061, 15286922888307293287, 1483371444025889427763765389467527889556636442659800720575790059738807, ... %C A273599 a(14) > 50000. - _Michael S. Branicky_, Nov 11 2024 %t A273599 Select[Range[1, 10000], PrimeQ[(11^# - 7^#)/4] &] %o A273599 (PARI) for(n=1, 10000, if(isprime((11^n - 7^n)/4), print1(n, ", "))) %Y A273599 Cf. A005808, A210506, A128027, A216181, A128347, A273598, A273600, A273601, A062577. %K A273599 nonn,more,hard %O A273599 1,1 %A A273599 _Tim Johannes Ohrtmann_, May 26 2016