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 A098117 #17 Sep 08 2022 08:45:14
%S A098117 29,149,3749,93749,58593749,1464843749,915527343749,22888183593749,
%T A098117 14305114746093749,223517417907714843749,5587935447692871093749,
%U A098117 87311491370201110839843749,54569682106375694274902343749,1364242052659392356872558593749
%N A098117 a(n) = 5^(prime(n) - 1) + 5^prime(n) - 1.
%F A098117 a(n) = A198764(prime(n)-1) = A198764(A000040(n)-1). - _Michel Marcus_, Aug 27 2015
%e A098117 a(1) = 5^(2 - 1) + (5^2 - 1) = 29.
%t A098117 Table[5^(Prime[n] - 1) + (5^Prime[n] - 1), {n, 1, 15}] (* _Stefan Steinerberger_, Feb 28 2006 *)
%o A098117 (PARI) main(m)=forprime(p=2,100, print1(", ",5^(p-1) + (5^p - 1))) \\ _Anders Hellström_, Aug 26 2015
%o A098117 (Magma) [5^(NthPrime(n)-1) + 5^NthPrime(n) - 1: n in [1..20]]; // _Vincenzo Librandi_, Aug 27 2015
%Y A098117 Cf. A097743.
%K A098117 nonn
%O A098117 1,1
%A A098117 _Parthasarathy Nambi_, Sep 23 2004
%E A098117 More terms from _Stefan Steinerberger_, Feb 28 2006
%E A098117 a(14) from _Vincenzo Librandi_, Aug 27 2015