箴言家 aphorist, 手動 fortune [-o] on manual, 沖積世生まれ born in the alluvial epoch, 部分的に一倍体 a monoploid partially.
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74 days ago
三角数に関して, T_{2n−1} − T_n = 3 T_{n−1}, T_{2n} − T_{n−1} = 3 T_n が成り立つ. #math
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