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 A173718 #16 Jul 29 2023 22:10:45 %S A173718 2,3,5,13,29,37,1021,1399,2137,4493,5521,108553,200807 %N A173718 Numbers n such that (9^n - 2^n)/7 is prime. %C A173718 All terms are prime. %C A173718 a(14) > 10^6. %H A173718 Jon Grantham and Andrew Granville, <a href="https://arxiv.org/abs/2307.07894">Fibonacci primes, primes of the form 2^n-k and beyond</a>, arXiv:2307.07894 [math.NT], 2023. %t A173718 Select[ Prime[ Range[1, 100000] ], PrimeQ[ (9^# - 2^#)/7 ]& ] %o A173718 (PARI) is(n)=ispseudoprime((9^n-2^n)/7) \\ _Charles R Greathouse IV_, Jun 06 2017 %Y A173718 Cf. A004063, A028491, A057468, A059801, A121877, A128024, A128025, A128026, A128027, A128028, A128029, A128030, A128031, A128032. %K A173718 hard,more,nonn %O A173718 1,1 %A A173718 _Robert Price_, Dec 22 2012 %E A173718 a(12)-a(13) from _Jon Grantham_, Jul 29 2023