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 A219045 #20 Nov 12 2023 11:34:59
%S A219045 7,10,13,22,27,30,57,62,117,255,535,651,873,998,1502,18145,22766,
%T A219045 25770,43558,45663,48058,62887,87477,103585,115802
%N A219045 Numbers k such that 3^k - 26 is prime.
%C A219045 a(26) > 2*10^5. - _Robert Price_, Nov 20 2013
%e A219045 3^7 - 26 = 2161 (prime), so 7 is in the sequence.
%t A219045 Do[If[PrimeQ[3^n - 26], Print[n]], {n, 3, 10000}]
%o A219045 (PARI) is(n)=isprime(3^n-26) \\ _Charles R Greathouse IV_, Feb 17 2017
%Y A219045 Cf. Sequences of numbers k such that 3^k + m is prime:
%Y A219045 (m = 2) A051783, (m = -2) A014224, (m = 4) A058958, (m = -4) A058959,
%Y A219045 (m = 8) A217136, (m = -8) A217135, (m = 10) A217137, (m = -10) A217347,
%Y A219045 (m = 14) A219035, (m = -14) A219038, (m = 16) A205647, (m = -16) A219039,
%Y A219045 (m = 20) A219040, (m = -20) A219041, (m = 22) A219042, (m = -22) A219043,
%Y A219045 (m = 26) A219044, (m = -26) A219045, (m = 28) A219046, (m = -28) A219047,
%Y A219045 (m = 32) A219048, (m = -32) A219049, (m = 34) A219050, (m = -34) A219051. Note that if m is a multiple of 3, 3^k + m is also a multiple of 3 (for k greater than 0), and as such isn't prime.
%K A219045 nonn,more
%O A219045 1,1
%A A219045 _Nicolas M. Perrault_, Nov 10 2012
%E A219045 a(16)-a(25) from _Robert Price_, Nov 20 2013