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 A035044 #18 Jul 08 2025 21:29:34
%S A035044 0,1,3,2,4,5,6,7,8,9,10,11,13,12,14,15,16,17,18,19,30,31,33,32,34,35,
%T A035044 36,37,38,39,20,21,23,22,24,25,26,27,28,29,40,41,43,42,44,45,46,47,48,
%U A035044 49,50,51,53,52,54,55,56,57,58,59,60,61,63,62,64,65,66,67,68
%N A035044 Exchange 2 and 3.
%C A035044 The map which is applied to primes in A171018. - _M. F. Hasler_, Feb 12 2013
%C A035044 Rearrangement of A001477 (the nonnegative integers). - _Zak Seidov_, Feb 15 2013
%H A035044 Vincenzo Librandi, <a href="/A035044/b035044.txt">Table of n, a(n) for n = 0..1000</a>
%t A035044 FromDigits[IntegerDigits[#]/.{2->3,3->2}]&/@Range[0,68] (* _Zak Seidov_, Feb 15 2013 *)
%o A035044 (PARI) A222227(n, d=[0, 1, 3, 2, 4, 5, 6, 7, 8, 9])=sum(i=1, #n=digits(n), d[n[i]+1]*10^(#n-i)) \\ gives correct value for n=0 iff d[1]=0, since digits(0)=[] in PARI (v.2.6), _M. F. Hasler_, Feb 12 2013
%Y A035044 Cf. A001477, A171018, A222210-A222254; A171013-A171016, A175770.
%K A035044 nonn,base,easy
%O A035044 0,3
%A A035044 _N. J. A. Sloane_