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 A262782 #11 Apr 04 2016 23:29:20
%S A262782 9,36,279,2466,179613,1773936,130914099,1293175566,95436354393,
%T A262782 68725813719276,686399210003223,450970305101000586,
%U A262782 36923966682271786989,365180934076808864616,26953995293034312152403,19410199662973054208949126,14149796291401707558973760193,141323271117050318101857059796
%N A262782 a(n) = sum_{k=1..n} 3^prime(k).
%e A262782 a(2) = 3^prime(1) + 3^prime(2) = 3^2+3^3=36.
%t A262782 Accumulate@ Array[3^Prime@ # &, {18}] (* _Michael De Vlieger_, Mar 24 2016 *)
%o A262782 (PARI) a(n) = sum(k=1, n, 3^prime(k)); \\ _Altug Alkan_, Mar 24 2016
%Y A262782 Cf. A057901.
%K A262782 nonn,easy
%O A262782 1,1
%A A262782 _Emre APARI_, Mar 24 2016
%E A262782 More terms from _Michael De Vlieger_, Mar 24 2016