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A256573 God's number for Rubik's cube size n X n X n (quarter-turn metric). 1
0, 14, 26 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

"God's Number" is the maximum number of turns required to solve any scramble of cube. "Quarter-turn metric" considers a 90-degree turn of any side to be a single turn, while a 180-degree turn is considered two turns. Cubes of larger size than 3 X 3 X 3 are not solved for God's number.

LINKS

Table of n, a(n) for n=1..3.

Jerry Bryan, God's Algorithm for the 2x2x2 Pocket Cube

Tomas Rokicki, Morley Davidson, God's Number is 26 in the Quarter-Turn Metric

CROSSREFS

Cf. A257401 (half-turn metric), A054434 (possible positions), A075152 (possible permutations).

Sequence in context: A079505 A039604 A199405 * A030786 A094163 A134837

Adjacent sequences:  A256570 A256571 A256572 * A256574 A256575 A256576

KEYWORD

nonn,hard,more,bref

AUTHOR

Peter Woodward, Apr 22 2015

STATUS

approved

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Last modified October 18 07:42 EDT 2019. Contains 328146 sequences. (Running on oeis4.)