login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A253075 Number of ON cells at generation n in a certain two-dimensional cellular automaton that produces a roughly circular pattern. 1
7, 17, 27, 31, 39, 51, 63, 79, 83, 89, 101, 115, 123, 139, 159, 191, 207, 219, 235, 261, 273, 287, 313, 349, 373, 401, 425, 457, 489, 523, 559, 579, 607, 633, 667, 691, 733, 771, 817, 855, 891, 931, 977, 1007, 1037, 1079, 1141, 1191, 1241 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

This is the CA on the square grid, defined by Rule 175850, and started with 7 adjacent ON cells. It is shown on page 177 of Wolfram's A New Kind of Science.

LINKS

Table of n, a(n) for n=0..48.

N. J. A. Sloane, Illustration of initial terms

S. Wolfram, A New Kind of Science, Wolfram Media Inc., (2002), p. 177

Index entries for sequences related to cellular automata

MATHEMATICA

ArrayPlot /@ CellularAutomaton[{175850, {2, {{2, 2, 2}, {2, 1, 2}, {2, 2, 2}}}, {1, 1}}, {{{1, 1, 1, 1, 1, 1, 1}}, 0}, 16] (Produces illustrations)

Total@*Total /@ CellularAutomaton[{175850, {2, {{2, 2, 2}, {2, 1, 2}, {2, 2, 2}}}, {1, 1}}, {{{1, 1, 1, 1, 1, 1, 1}}, 0}, 32] (Produces sequence)

CROSSREFS

Sequence in context: A183897 A300186 A261934 * A011537 A283610 A043517

Adjacent sequences:  A253072 A253073 A253074 * A253076 A253077 A253078

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Feb 01 2015

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 23 14:42 EDT 2021. Contains 348214 sequences. (Running on oeis4.)