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 A084706 #23 Jun 02 2025 00:16:02 %S A084706 3,5,13,17,113,97,193,257,769,11777,13313,59393,12289,40961,114689, %T A084706 65537,2424833,6946817,786433,5767169,7340033,23068673,155189249, %U A084706 595591169,1224736769,167772161,469762049,2281701377,3489660929,12348030977,3221225473 %N A084706 Duplicate of A051900. %K A084706 dead %O A084706 0,1 %A A084706 _Amarnath Murthy_, Jun 09 2003