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 A066593 #4 Dec 05 2013 19:55:05 %S A066593 2,11,41,101,181,211,241,281,401,421,641,811,821,881,1021,1181,1201, %T A066593 1321,1481,1601,1621,1801,1811,2011,2081,2111,2141,2161,2221,2281, %U A066593 2411,2441,2801,3221,4001,4021,4111,4201,4211,4241,4421,4441,4481 %N A066593 Primes which can be expressed as concatenation of powers of 2 and 0's. %e A066593 1321 is a term as it is a concatenation of 1, 32 and 1 which are powers of 2. %Y A066593 Cf. A066591, A066592. %K A066593 base,easy,nonn %O A066593 1,1 %A A066593 _Amarnath Murthy_, Dec 21 2001 %E A066593 Corrected and extended by Christopher Lund (clund(AT)san.rr.com), Apr 14 2002