0,1

r,l,u,d,f,b are respectively right, left, up, down, front, back faces of a 3 X 3 Rubik's cube. Set M=2, R=3, L=5, U=7, D=11, F=13, B=17, where M is 90 degree turn of the middle slice of Rubik's cube; R is 90 degrees turn of the right face, L is 90 degree turn of the left face... The moves to permute (ufr,dfr)(ubr,ubl) corners are: (R*U)*(R^3*U^3)*(R*U)*(R^3*U^3)*(R*U)*(R^3*U^3)=(3*7)*(3^3*7^3)*(3*7)*(3^3*7^3)*(3*7)*(3^3*7^3)=21*9261*21*9261*21*9261; Note that as the order of 90 degrees turn T is 4, then T^2=T^-2 and T^3=T^-1. Moves adapted from 'Adventure in group theory', D. Joyner, J. Hopkins Press.

21 = 3*7 codes R*U moves

Cf. A135819 A135820 A135823 A135824 A135825 A135826 A135827.

Sequence in context: A055416 A074053 A028451 this_sequence A013726 A159358 A048914

Adjacent sequences: A135820 A135821 A135822 this_sequence A135824 A135825 A135826

fini,full,nonn

Giorgio Balzarotti & Paolo P. Lava (greenblue(AT)tiscali.it), Nov 29 2007