A160727 a(n) = A161415(n+1)/4.

2, 3, 7, 3, 9, 9, 23, 3, 9, 9, 27, 9, 27, 27, 73, 3, 9, 9, 27, 9, 27, 27, 81, 9, 27, 27, 81, 27, 81, 81, 227, 3, 9, 9, 27, 9, 27, 27, 81, 9, 27, 27, 81, 27, 81, 81, 243, 9, 27, 27, 81, 27, 81, 81, 243, 27, 81, 81, 243, 81, 243, 243, 697, 3, 9, 9, 27, 9

Offset: 1

Author

Omar E. Pol, Jun 13 2009

Keywords

• nonn
• tabf

Examples

			From _Omar E. Pol_, Jan 01 2014: (Start)
Written as an irregular triangle in which row lengths is A000079 the sequence begins:
2;
3,7;
3,9,9,23;
3,9,9,27,9,27,27,73;
3,9,9,27,9,27,27,81,9,27,27,81,27,81,81,227;
3,9,9,27,9,27,27,81,9,27,27,81,27,81,81,243,9,27,27,81,27, 81,81,243,27,81,81,243,81,243,243,697;
(End)
		

Links

• Paolo Xausa, Table of n, a(n) for n = 1..10000
• N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS

Crossrefs

Cf. A152978, A153000, A160414, A161415.

Programs

Mathematica

A160727[n_]:=3^DigitCount[n,2,1]-If[IntegerQ[Log2[n+1]],(n+1)/2,0];Array[A160727,100] (* Paolo Xausa, Sep 01 2023 *)

Formula

a(n) = A048883(n), except a(n) = A048883(n) - (n+1)/2 if n is a power of 2 minus 1. - Omar E. Pol, Jan 06 2014

Extensions

a(11)-a(58) from M. F. Hasler, Dec 03 2012

a(59)-a(68) from Omar E. Pol, Jan 06 2014