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 A273600 #9 Nov 11 2024 14:18:29 %S A273600 2,7,11,17,37,521,877,2423 %N A273600 Numbers k such that (11^k - 8^k)/3 is prime. %C A273600 All terms are prime. %C A273600 The corresponding primes: 19, 5796673, 92240578673, 167731742895202841, 113345629904382710526197539019199125641, ... %C A273600 a(9) > 50000. - _Michael S. Branicky_, Nov 11 2024 %t A273600 Select[Range[1, 10000], PrimeQ[(11^# - 8^#)/3] &] %o A273600 (PARI) for(n=1, 10000, if(isprime((11^n - 8^n)/3), print1(n, ", "))) %Y A273600 Cf. A005808, A210506, A128027, A216181, A128347, A273598, A273599, A273601, A062577. %K A273600 nonn,more,hard %O A273600 1,1 %A A273600 _Tim Johannes Ohrtmann_, May 26 2016