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 A378556 #10 Dec 12 2024 23:32:03 %S A378556 1,4,8,16,64,4096,16384,65536,1048576,4194304,8388608,67108864, %T A378556 17179869184,34359738368,68719476736,549755813888,4398046511104, %U A378556 70368744177664,18014398509481984,18446744073709551616,18889465931478580854784,9671406556917033397649408,374144419156711147060143317175368453031918731001856 %N A378556 Powers of 2 that do not include the digit 2. %C A378556 Any additional terms have exponent at least 10^5. %F A378556 a(n) = 2^A034293(n). %t A378556 Select[2^Range[0,100000],Not[MemberQ[IntegerDigits[#],2]]&] %Y A378556 Cf. A000079, A034293. %K A378556 nonn,base %O A378556 1,2 %A A378556 _Erich Friedman_, Nov 30 2024