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 A273598 #15 Nov 11 2024 02:07:54 %S A273598 2,3,11,163,191,269,1381,1493,38453 %N A273598 Numbers k such that (11^k - 6^k)/5 is prime. %C A273598 All terms are prime. %C A273598 The corresponding primes: 17, 223, 56989774711, ... %t A273598 Select[Range[1, 10000], PrimeQ[(11^# - 6^#)/5] &] %o A273598 (PARI) for(n=1, 10000, if(isprime((11^n - 6^n)/5), print1(n, ", "))) %Y A273598 Cf. A005808, A210506, A128027, A216181, A128347, A273599, A273600, A273601, A062577. %K A273598 nonn,more,hard %O A273598 1,1 %A A273598 _Tim Johannes Ohrtmann_, May 26 2016 %E A273598 a(9) from _Michael S. Branicky_, Nov 10 2024