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

Author

Juri-Stepan Gerasimov, Jun 07 2009

Keywords

• nonn
• base

Links

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

Crossrefs

Cf. A000043, A007090, A160962.

Programs

Mathematica

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

Formula

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

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