



1, 1, 3, 1, 3, 3, 7, 3, 3, 3, 7, 5, 7, 9, 17, 9, 3, 3, 7, 5, 7, 9, 17, 11, 7, 9, 17, 17, 19, 23, 39, 27, 7, 3, 7, 5, 7, 9, 17, 11, 7, 9, 17, 17, 19, 23, 39, 29, 11, 9, 17, 17, 19, 25, 43, 39, 25, 23, 39, 45, 47, 57, 93, 77, 23, 3, 7, 5, 7, 9
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OFFSET

1,3


COMMENTS

Also, first differences of A161910. [From Omar E. Pol, Jun 21 2009]


LINKS

Table of n, a(n) for n=1..70.
David Applegate, Omar E. Pol and N. J. A. Sloane, The Toothpick Sequence and Other Sequences from Cellular Automata, Congressus Numerantium, Vol. 206 (2010), 157191. [There is a typo in Theorem 6: (13) should read u(n) = 4.3^(wt(n1)1) for n >= 2.]
N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS


EXAMPLE

Note that this can be written as a triangle:
1;
1;
3;
1,3;
3,7,3,3;
3,7,5,7,9,17,9,3;
3,7,5,7,9,17,11,7,9,17,17,19,23,39,27,7;
3,7,5,7,9,17,11,7,9,17,17,19,23,39,29,11,9,17,17,19,25,43,39,25,23,39,45,47,57,93,77,23;
3,7,5,7,9,...


CROSSREFS

Ytoothpick sequence: A160120. Cf. A160121, A160122.
Cf. A139250, A139251. [From Omar E. Pol, Jun 16 2009]
Cf. A161831, A161427, A161910. [From Omar E. Pol, Jun 21 2009]
Sequence in context: A173465 A151837 A163381 * A238784 A147610 A238313
Adjacent sequences: A160120 A160121 A160122 * A160124 A160125 A160126


KEYWORD

nonn


AUTHOR

Omar E. Pol, May 02 2009, May 21 2010


EXTENSIONS

More terms from Omar E. Pol, Jun 16 2009
Extended by R. J. Mathar, Feb 05 2010


STATUS

approved



