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GAIさんへのお返事です。
> 最後の3手
> x<yとして、組(x,2x,y) → (2x,2x,y-x) → (0,4x,y-x) となる。
> これより、x+2x+y=Nとして、3x=N-y
> この式を満たす(x,y)に着目する。
x<yとして、組(x,3x,y) → (2x,3x-x,y)=(2x,2x,y) → (0,4x,y) となる。
これも条件をみたしますね。
50の範囲では、
(27,35,43) 9 回
0: (27,35,43)
1: (54,8,43)
2: (46,16,43)
3: (30,32,43)
4: (60,2,43)
5: (60,4,41)
6: (56,8,41)
7: (48,16,41)
8: (32,32,41)
9: (0,64,41)
0: (27,35,43)
1: (54,8,43)
2: (46,16,43)
3: (30,32,43)
4: (60,2,43)
5: (60,4,41)
6: (56,8,41)
7: (48,16,41)
8: (32,32,41)
9: (64,0,41)
0: (27,35,43)
1: (54,8,43)
2: (46,16,43)
3: (3,16,86)
4: (6,13,86)
5: (6,26,73)
6: (12,20,73)
7: (24,8,73)
8: (16,16,73)
9: (0,32,73)
0: (27,35,43)
1: (54,8,43)
2: (46,16,43)
3: (3,16,86)
4: (6,13,86)
5: (6,26,73)
6: (12,20,73)
7: (24,8,73)
8: (16,16,73)
9: (32,0,73)
0: (27,35,43)
1: (54,8,43)
2: (46,16,43)
3: (3,16,86)
4: (6,16,83)
5: (12,10,83)
6: (12,20,73)
7: (24,8,73)
8: (16,16,73)
9: (0,32,73)
0: (27,35,43)
1: (54,8,43)
2: (46,16,43)
3: (3,16,86)
4: (6,16,83)
5: (12,10,83)
6: (12,20,73)
7: (24,8,73)
8: (16,16,73)
9: (32,0,73)
0: (27,35,43)
1: (54,8,43)
2: (46,16,43)
3: (3,16,86)
4: (6,16,83)
5: (12,16,77)
6: (24,4,77)
7: (24,8,73)
8: (16,16,73)
9: (0,32,73)
0: (27,35,43)
1: (54,8,43)
2: (46,16,43)
3: (3,16,86)
4: (6,16,83)
5: (12,16,77)
6: (24,4,77)
7: (24,8,73)
8: (16,16,73)
9: (32,0,73)
0: (27,35,43)
1: (54,8,43)
2: (46,16,43)
3: (3,16,86)
4: (6,16,83)
5: (12,16,77)
6: (24,16,65)
7: (48,16,41)
8: (32,32,41)
9: (0,64,41)
0: (27,35,43)
1: (54,8,43)
2: (46,16,43)
3: (3,16,86)
4: (6,16,83)
5: (12,16,77)
6: (24,16,65)
7: (48,16,41)
8: (32,32,41)
9: (64,0,41)
0: (27,35,43)
1: (54,8,43)
2: (11,8,86)
3: (3,16,86)
4: (6,13,86)
5: (6,26,73)
6: (12,20,73)
7: (24,8,73)
8: (16,16,73)
9: (0,32,73)
0: (27,35,43)
1: (54,8,43)
2: (11,8,86)
3: (3,16,86)
4: (6,13,86)
5: (6,26,73)
6: (12,20,73)
7: (24,8,73)
8: (16,16,73)
9: (32,0,73)
0: (27,35,43)
1: (54,8,43)
2: (11,8,86)
3: (3,16,86)
4: (6,16,83)
5: (12,10,83)
6: (12,20,73)
7: (24,8,73)
8: (16,16,73)
9: (0,32,73)
0: (27,35,43)
1: (54,8,43)
2: (11,8,86)
3: (3,16,86)
4: (6,16,83)
5: (12,10,83)
6: (12,20,73)
7: (24,8,73)
8: (16,16,73)
9: (32,0,73)
0: (27,35,43)
1: (54,8,43)
2: (11,8,86)
3: (3,16,86)
4: (6,16,83)
5: (12,16,77)
6: (24,4,77)
7: (24,8,73)
8: (16,16,73)
9: (0,32,73)
0: (27,35,43)
1: (54,8,43)
2: (11,8,86)
3: (3,16,86)
4: (6,16,83)
5: (12,16,77)
6: (24,4,77)
7: (24,8,73)
8: (16,16,73)
9: (32,0,73)
0: (27,35,43)
1: (54,8,43)
2: (11,8,86)
3: (3,16,86)
4: (6,16,83)
5: (12,16,77)
6: (24,16,65)
7: (48,16,41)
8: (32,32,41)
9: (0,64,41)
0: (27,35,43)
1: (54,8,43)
2: (11,8,86)
3: (3,16,86)
4: (6,16,83)
5: (12,16,77)
6: (24,16,65)
7: (48,16,41)
8: (32,32,41)
9: (64,0,41)
0: (27,35,43)
1: (54,8,43)
2: (11,8,86)
3: (22,8,75)
4: (14,16,75)
5: (28,2,75)
6: (28,4,73)
7: (24,8,73)
8: (16,16,73)
9: (0,32,73)
0: (27,35,43)
1: (54,8,43)
2: (11,8,86)
3: (22,8,75)
4: (14,16,75)
5: (28,2,75)
6: (28,4,73)
7: (24,8,73)
8: (16,16,73)
9: (32,0,73)
0: (27,35,43)
1: (54,8,43)
2: (11,8,86)
3: (11,16,78)
4: (22,5,78)
5: (22,10,73)
6: (12,20,73)
7: (24,8,73)
8: (16,16,73)
9: (0,32,73)
0: (27,35,43)
1: (54,8,43)
2: (11,8,86)
3: (11,16,78)
4: (22,5,78)
5: (22,10,73)
6: (12,20,73)
7: (24,8,73)
8: (16,16,73)
9: (32,0,73)
0: (27,35,43)
1: (54,35,16)
2: (38,35,32)
3: (38,3,64)
4: (76,3,26)
5: (73,6,26)
6: (73,12,20)
7: (73,24,8)
8: (73,16,16)
9: (73,0,32)
0: (27,35,43)
1: (54,35,16)
2: (38,35,32)
3: (38,3,64)
4: (76,3,26)
5: (73,6,26)
6: (73,12,20)
7: (73,24,8)
8: (73,16,16)
9: (73,32,0)
0: (27,35,43)
1: (54,35,16)
2: (38,35,32)
3: (38,3,64)
4: (76,3,26)
5: (50,3,52)
6: (100,3,2)
7: (97,6,2)
8: (97,4,4)
9: (97,0,8)
0: (27,35,43)
1: (54,35,16)
2: (38,35,32)
3: (38,3,64)
4: (76,3,26)
5: (50,3,52)
6: (100,3,2)
7: (97,6,2)
8: (97,4,4)
9: (97,8,0)
0: (27,35,43)
1: (54,35,16)
2: (38,35,32)
3: (38,3,64)
4: (38,6,61)
5: (38,12,55)
6: (38,24,43)
7: (38,48,19)
8: (38,29,38)
9: (0,29,76)
0: (27,35,43)
1: (54,35,16)
2: (38,35,32)
3: (38,3,64)
4: (38,6,61)
5: (38,12,55)
6: (38,24,43)
7: (38,48,19)
8: (38,29,38)
9: (76,29,0)
0: (27,35,43)
1: (54,35,16)
2: (54,19,32)
3: (54,38,13)
4: (41,38,26)
5: (41,12,52)
6: (41,24,40)
7: (41,48,16)
8: (41,32,32)
9: (41,0,64)
0: (27,35,43)
1: (54,35,16)
2: (54,19,32)
3: (54,38,13)
4: (41,38,26)
5: (41,12,52)
6: (41,24,40)
7: (41,48,16)
8: (41,32,32)
9: (41,64,0)
0: (27,35,43)
1: (54,35,16)
2: (54,19,32)
3: (54,38,13)
4: (54,25,26)
5: (54,50,1)
6: (4,100,1)
7: (4,99,2)
8: (4,97,4)
9: (0,97,8)
0: (27,35,43)
1: (54,35,16)
2: (54,19,32)
3: (54,38,13)
4: (54,25,26)
5: (54,50,1)
6: (4,100,1)
7: (4,99,2)
8: (4,97,4)
9: (8,97,0)
つづく
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