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

1,1

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

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

Example

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)

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 *)

Crossrefs

Cf. A152978, A153000, A160414, A161415.

Sequence in context: A054144 A226985 A174407 * A187152 A086508 A085641

Adjacent sequences: A160724 A160725 A160726 * A160728 A160729 A160730

Keyword

nonn,tabf

Author

Omar E. Pol, Jun 13 2009

Extensions

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

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

Status

approved