A262779 Binary representation of the n-th iteration of the "Rule 175" elementary cellular automaton starting with a single ON (black) cell.

1, 110, 11011, 1101111, 110111111, 11011111111, 1101111111111, 110111111111111, 11011111111111111, 1101111111111111111, 110111111111111111111, 11011111111111111111111, 1101111111111111111111111, 110111111111111111111111111, 11011111111111111111111111111

Offset

0,2

References

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

Links

Robert Price, Table of n, a(n) for n = 0..1000

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

Formula

Conjectures from Colin Barker, Jan 20 2016 and Apr 17 2019: (Start)

a(n) = 101*a(n-1)-100*a(n-2) for n>2.

G.f.: (1+9*x+x^2) / ((1-x)*(1-100*x)).

(End)

Mathematica

rule=175; rows=20; ca=CellularAutomaton[rule, {{1}, 0}, rows-1, {All, All}]; (* Start with single black cell *) catri=Table[Take[ca[[k]], {rows-k+1, rows+k-1}], {k, 1, rows}]; (* Truncated list of each row *) Table[FromDigits[catri[[k]]], {k, 1, rows}]   (* Binary Representation of Rows *)

Crossrefs

Cf. A265186, A198694.

Sequence in context: A265696 A267535 A267577 * A058935 A266975 A265320

Adjacent sequences: A262776 A262777 A262778 * A262780 A262781 A262782

Keyword

nonn,easy

Author

Robert Price, Jan 18 2016

Status

approved