A265172 - OEIS

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A265172

Binary representation of the n-th iteration of the "Rule 90" elementary cellular automaton starting with a single ON (black) cell.

1, 101, 10001, 1010101, 100000001, 10100000101, 1000100010001, 101010101010101, 10000000000000001, 1010000000000000101, 100010000000000010001, 10101010000000001010101, 1000000010000000100000001, 101000001010000010100000101, 10001000100010001000100010001

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

COMMENTS

Rules 26, 82, 90, 146, 154, 210 and 218 also generate this sequence.

REFERENCES

S. Wolfram, A New Kind of Science, Wolfram Media, 2002; p. 55.

LINKS

Robert Price, Table of n, a(n) for n = 0..999

Eric Weisstein's World of Mathematics, Elementary Cellular Automaton

S. Wolfram, A New Kind of Science

Index entries for sequences related to cellular automata

Index to Elementary Cellular Automata

MATHEMATICA

rule = 90; rows = 20; Table[FromDigits[Table[Take[CellularAutomaton[rule, {{1}, 0}, rows-1, {All, All}][[k]], {rows-k+1, rows+k-1}], {k, 1, rows}][[k]]], {k, 1, rows}]

CROSSREFS

Cf. A070886.

Sequence in context: A291990 A303572 A152756 * A153500 A262861 A371563

Adjacent sequences: A265169 A265170 A265171 * A265173 A265174 A265175

KEYWORD

nonn,easy

AUTHOR

Robert Price, Dec 05 2015

STATUS

approved