Myriagonal number
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A myriagonal number is a number that can be arranged to form a myriagon. The formula is n*(4999n-4998). The first few myriagonal numbers are:
1, 10000, 29997, 59992, 99985, 149976, 209965, 279952, 359937, 449920, 549901, 659880, 779857, 909832, 1049805, 1199776, 1359745, 1529712, 1709677, 1899640