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 A161322 #11 Oct 16 2024 09:20:10 %S A161322 2,3,11,13,31,101,103,133,331,1121,1223,1333,20021,21133,103333, %T A161322 202123,203221,302101,1002131,1011013,2113121,2123111,2233031, %U A161322 10313201,11103011,11222221,22313101,111003203,122332213,200033101,310300123,2320301213,3101310221,10303010323 %N A161322 a(n) = A000043(n) written in base 4. %H A161322 Amiram Eldar, <a href="/A161322/b161322.txt">Table of n, a(n) for n = 1..48</a> %F A161322 a(n) = A007090(A000043(n)). - _Amiram Eldar_, Oct 16 2024 %t A161322 Map[FromDigits[IntegerDigits[#, 4]] &, MersennePrimeExponent[Range[48]]] (* _Amiram Eldar_, Oct 16 2024 *) %Y A161322 Cf. A000043, A007090, A160962. %K A161322 nonn,base %O A161322 1,1 %A A161322 _Juri-Stepan Gerasimov_, Jun 07 2009 %E A161322 Corrected (1301 replaced by 1223, 2021 replaced by 20021, 22311313 by 22313101) by _R. J. Mathar_, May 21 2010 %E A161322 a(32)-a(34) from _Amiram Eldar_, Oct 16 2024