令c=7,不定方程a^2+a*b^2+a^2*b-a+1=7^k的整数解——
7^1 {a=-2,b=0},{a=-2,b=2},{a=1,b=-3},{a=1,b=2},{a=3,b=-3},{a=3,b=0}
7^2 无解
7^3 {a=-18,b=0},{a=-18,b=18},{a=1,b=-19},{a=1,b=18},{a=19,b=-19},{a=19,b=0}
7^4 {a=-20,b=9},{a=-20,b=11},{a=10,b=-21},{a=10,b=11},{a=12,b=-21},{a=12,b=9}
7^6 无解
7^12 {a=-16340,b=51},{a=16290,b=51}
a b a^2+a*b^2+a^2*b-a+1 k
1 2 7 1
3 0 7 1
1 18 343 3
19 0 343 3
10 11 2401 4
12 9 2401 4
52 16289 13841287201 12
16290 51 13841287201 12
令c=7,不定方程a^2+a*b^2+a^2*b±a±1=7^k的整数解——
7^1 -a+1 {a=-2,b=0},{a=-2,b=2},{a=1,b=-3},{a=1,b=2},{a=3,b=-3},{a=3,b=0}
+a+1 {a=-3,b=0},{a=-3,b=3},{a=2,b=-2},{a=2,b=0},{a=3,b=-2},{a=3,b=-1}
-a-1 {a=1,b=-3},{a=1,b=2},{a=4,b=-3},{a=4,b=-1}
+a-1 {a=-2,b=1},{a=2,b=-3},{a=2,b=1}
7^2 -a+1 无解
+a+1 {a=24,b=-23},{a=24,b=-1}
-a-1 {a=-5,b=1},{a=-5,b=4},{a=2,b=-6},{a=2,b=4},{a=5,b=-6},{a=5,b=1}
+a-1 {a=-5,b=2},{a=-5,b=3},{a=25,b=-24},{a=25,b=-1}
7^3 -a+1 {a=-18,b=0},{a=-18,b=18},{a=1,b=-19},{a=1,b=18},{a=19,b=-19},{a=19,b=0}
+a+1 {a=-19,b=0},{a=-19,b=19},{a=2,b=-14},{a=2,b=12},{a=18,b=-18},{a=18,b=0},{a=171,b=-170},{a=171,b=-1}
-a-1 无解
+a-1 {a=1,b=-19},{a=1,b=18},{a=172,b=-171},{a=172,b=-1}
7^4 -a+1 {a=-20,b=9},{a=-20,b=11},{a=10,b=-21},{a=10,b=11},{a=12,b=-21},{a=12,b=9}
+a+1 {a=1200,b=-1199},{a=1200,b=-1}
-a-1 无解
+a-1 {a=1201,b=-1200},{a=1201,b=-1}
7^6 -a+1 无解
+a+1 {a=58824,b=-58823},{a=58824,b=-1}
-a-1 无解
+a-1 {a=58825,b=-58824},{a=58825,b=-1}
7^8 -a+1 无解
+a+1 {a=2882400,b=-2882399},{a=2882400,b=-1}
-a-1 无解
+a-1 {a=2882401,b=-2882400},{a=2882401,b=-1}
7^9 -a+1 无解
+a+1 无解
-a-1 无解
+a-1 {a=20176804,b=-20176803},{a=20176804,b=-1}
7^12 -a+1 {a=-16340,b=51},{a=16290,b=51}
+a+1 {a=6920643600,b=-6920643599},{a=6920643600,b=-1}
-a-1 无解
+a-1 {a=6920643601,b=-6920643600},{a=6920643601,b=-1}
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