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 A069598 #11 Nov 26 2014 21:38:04
%S A069598 2,3,5,7,11,101,10111,101111,1011001,1100101,10010101,10011101,
%T A069598 10100011,10101101,10110011,10111001,11000111,11100101,11110111,
%U A069598 11111101,100100111,100111001,101001001,101001011,101100011,101101111
%N A069598 Primes using only one nonzero digit (with zero digits allowed).
%C A069598 From the fifth term onwards only zeros and ones are used.
%C A069598 Any number composed only of a string of zeros and d's where d is a digit > 1 is divisible by d and not prime, so this sequence is the single-digit primes {2,3,5,7} UNION A020449.
%C A069598 The repunit primes (A004022) and A116692 are subsequences.
%Y A069598 Cf. A020449, A004022, A116692.
%K A069598 nonn,base
%O A069598 1,1
%A A069598 _Amarnath Murthy_, Mar 25 2002
%E A069598 Edited by _Rick L. Shepherd_, Sep 04 2009