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 A065830 #9 Apr 03 2023 10:36:10
%S A065830 1,3,6,13,27,55,110,220,440,881,1762,3524,7048,14097,28195,56390,
%T A065830 112781,225562,451125,902250,1804500,3609000,7218000,14436001,
%U A065830 28872002,57744005,115488011,230976023,461952047,923904094,1847808189
%N A065830 A065829 converted to base 10.
%H A065830 G. L. Honaker, Jr. and C. K. Caldwell, <a href="https://t5k.org/curios/page.php?short=881">Prime Curios! 881</a>
%t A065830 FromDigits[IntegerDigits[#],2]&/@(FromDigits/@Module[{bd=DeleteCases[ RealDigits[ Pi,10,200][[1]],_?(#>1&)]},Table[Take[bd,n],{n,Length[bd]}]]) (* _Harvey P. Dale_, Jul 02 2022 *)
%Y A065830 Cf. A065828 up to A065840, A000796, A011545, A011546, A055143.
%K A065830 nonn,base
%O A065830 1,2
%A A065830 _Patrick De Geest_, Nov 24 2001