谢谢 独木星空谁!是这串数吗?(36,37, 38,39错了?)
x+y+z+u+v+m=N的解组数,限制条件未知数取数不能取4的倍数
模4余数是0,LinearRecurrence[{6, -15, 20, -15, 6, -1}, {-21,0, 0, 0,21, 267}, 15]
{-21,0, 0, 0,21, 267, 1308, 4263, 10983, 24234, 47880, 87066, 148401, 240141, 372372}
模4余数是1,LinearRecurrence[{6, -15, 20, -15, 6, -1}, {-6, 0, 0, 0, 50, 426}, 15]
{-6, 0, 0, 0, 50, 426, 1812, 5482, 13482, 28812, 55608, 99324, 166914, 267014, 410124}
模4余数是2,LinearRecurrence[{6, -15, 20, -15, 6, -1}, {-1, 0, 0, 1, 96, 651}, 15]
{-1, 0, 0, 1, 96, 651, 2487, 7062, 16653, 34538, 65178,114399, 189574, 299805, 456105}
模4余数是3,LinearRecurrence[{6, -15, 20, -15, 6, -1}, {0, 0, 0, 6, 162, 932}, 15]
{0, 0, 0, 6, 162, 932, 3282, 8862, 20188, 40824, 75564, 130614, 213774, 334620, 504686}
9 87066 36
9.25 99324 37
9.5 114393 38
9.75 130578 39 |