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 A121623 #6 Dec 15 2017 17:37:05
%S A121623 2,2,4,9,51,103,498,1012,4649,42070,89055,738321,3054404,6649146,
%T A121623 27548565,210132966,1537632445,3475617204,25067027254,101057153476,
%U A121623 230767621110,1638690855904,6592587402477,45739388949584
%N A121623 Floor((prime(n)/n)^n).
%t A121623 Table[Floor[(Prime[n]/n)^n],{n,25}] (* _Harvey P. Dale_, Aug 11 2011 *)
%Y A121623 Cf. A121624.
%K A121623 easy,nonn
%O A121623 1,1
%A A121623 _Jason Earls_, Aug 11 2006