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例子
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a（1）=21，因为丢番图2x+3y=（2+3）^3有21个正解{x，y}：
{1, 41}, {4, 39}, {7, 37}, {10, 35}, {13, 33}, {16, 31}, {19, 29}, {22, 27}, {25, 25}, {28, 23}, {31, 21}, {34, 19}, {37, 17}, {40, 15}, {43, 13}, {46, 11}, {49, 9}, {52, 7}, {55, 5}, {58, 3}, {61, 1};
a（2）=34，因为丢番图3x+5y=（3+5）^3有34个正解{x，y}：
{4, 100}, {9, 97}, {14, 94}, {19, 91}, {24, 88}, {29, 85}, {34, 82}, {39, 79}, {44, 76}, {49, 73}, {54, 70}, {59, 67}, {64, 64}, {69, 61}, {74, 58}, {79, 55}, {84, 52}, {89, 49}, {94, 46}, {99, 43}, {104, 40}, {109, 37}, {114, 34}, {119, 31}, {124, 28}, {129, 25}, {134, 22}, {139, 19}, {144, 16}, {149, 13}, {154, 10}, {159, 7}, {164, 4}, {169, 1}.
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