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 A190480 #26 Jan 26 2021 18:04:24
%S A190480 1,10,101,1011,10111,101110,1011101,10111011,101110111,1011101111,
%T A190480 10111011111,101110111110,1011101111101,10111011111011,
%U A190480 101110111110111,1011101111101111,10111011111011110,101110111110111101,1011101111101111011
%N A190480 Concatenation of first n digits in the concatenation of first n primes written in base 2.
%C A190480 The terms are 1, 2, 5, 11, 23, 46, 93, 185, 375, ... in decimal.
%C A190480 The terms are the first n digits of the concatenation 10//11//101//111//1011//1101//.. generated with A004676.
%t A190480 With[{cc=Flatten[Table[IntegerDigits[p,2],{p,Prime[ Range[ 10]]}]]},Table[ FromDigits[Take[cc,n]],{n,Length[cc]}]] (* _Harvey P. Dale_, Jan 26 2021 *)
%Y A190480 Cf. A019518.
%K A190480 nonn,easy,base
%O A190480 1,2
%A A190480 _Juri-Stepan Gerasimov_, May 24 2011