A161322 a(n) = A000043(n) written in base 4.

2, 3, 11, 13, 31, 101, 103, 133, 331, 1121, 1223, 1333, 20021, 21133, 103333, 202123, 203221, 302101, 1002131, 1011013, 2113121, 2123111, 2233031, 10313201, 11103011, 11222221, 22313101, 111003203, 122332213, 200033101, 310300123, 2320301213, 3101310221, 10303010323

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..48

Formula

a(n) = A007090(A000043(n)). - Amiram Eldar, Oct 16 2024

Mathematica

Map[FromDigits[IntegerDigits[#, 4]] &, MersennePrimeExponent[Range[48]]] (* Amiram Eldar, Oct 16 2024 *)

Crossrefs

Cf. A000043, A007090, A160962.

Sequence in context: A234530 A235632 A085306 * A393520 A123239 A048891

Adjacent sequences: A161319 A161320 A161321 * A161323 A161324 A161325

Keyword

nonn,base

Author

Juri-Stepan Gerasimov, Jun 07 2009

Extensions

Corrected (1301 replaced by 1223, 2021 replaced by 20021, 22311313 by 22313101) by R. J. Mathar, May 21 2010

a(32)-a(34) from Amiram Eldar, Oct 16 2024

Status

approved