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A051023 Middle column of rule-30 1-D cellular automaton, from a lone 1 cell. 23
1, 1, 0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 0, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

A092539(n) gives the value of prefix of length n+1, seen as a binary number. - Reinhard Zumkeller, Jun 08 2013

Also middle column of rule 86 1-D cellular automaton, from a lone 1 cell, as rule 86 is the mirror image of rule 30. - Antti Karttunen, Oct 03 2019

LINKS

Antti Karttunen, Table of n, a(n) for n = 0..100000 (terms 0..10000 from Reinhard Zumkeller)

Erica Jen, Global properties of cellular automata, Journal of Statistical Physics 43 (1986), pp 219-242.

Eric Weisstein's World of Mathematics, Elementary Cellular Automaton.

Eric Weisstein's World of Mathematics, Rule 30

Eric Weisstein's World of Mathematics, Random Number

Xiangdong Wen, A Billion Bits of the Center Column of the Rule 30 Cellular Automaton, 2019

Stephen Wolfram, Announcing the Rule 30 Prizes, 2019

Stephen Wolfram, A Million Bits of the Center Column of the Rule 30 Cellular Automaton, 2017

Wolfram Mathematica, Cellular automata: Mathematica notebooks

Index entries for sequences related to cellular automata

Index entries for characteristic functions

FORMULA

a(n) = A070950(n,n). - Reinhard Zumkeller, Jun 06 2013

a(n) = 1 - A226474(n). - Reinhard Zumkeller, Jun 08 2013

From Antti Karttunen, Oct 04 2019: (Start)

a(n) = A000035(floor(A110240(n) / 2^n)).

For n>= 2, a(n) = (A328100(n) OR A328101(n)) XOR A328101(1+n). ["Sideways evaluation"]

(End)

MATHEMATICA

CellularAutomaton[30, {{1}, 0}, 101, {All, {0}}]//Flatten

PROG

(Haskell)

a051023 n = a070950 n n  -- Reinhard Zumkeller, Jun 06 2013

(PARI)

A051023(n) = ((A110240(n)>>n)%2);

\\ Or for fast creation of b-files:

A051023write(up_to) = { my(s=1, n=0); for(n=0, up_to, write("b051023.txt", n, " ", ((s>>n)%2)); s = A269160(s)); }; \\ Antti Karttunen, Oct 03 2019

CROSSREFS

Cf. A070950, A269160 (rule 30), A071032, A269161 (rule 86).

Cf. A000035, A092539, A226474.

Cf. A327974 (adjacent bits xored), A327982 (partial sums), A327983 (run lengths).

Characteristic function of A327984 (gives the positions of ones in this sequence), A327985 (positions of zeros).

Cf. also A328100, A328101, A328102 (neighbor columns).

Sequence in context: A176329 A305994 A030302 * A247795 A030657 A249066

Adjacent sequences:  A051020 A051021 A051022 * A051024 A051025 A051026

KEYWORD

nonn

AUTHOR

Eric W. Weisstein

EXTENSIONS

Corrected from 64th term by Daniel B. Cristofani (cristofd(AT)hevanet.com), Jan 07 2004

STATUS

approved

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Last modified October 21 16:50 EDT 2019. Contains 328302 sequences. (Running on oeis4.)