1 หนังสืออิเล็กทรอนิกส์โดย Liz Strachan
Liz Strachan: Numbers Are Forever
This book is only about numbers – that is, whole numbers and nothing but the whole numbers, which start from from 0, 1, 2, 3, 4… and go on forever. Here you can meet perfect numbers, happy numbers, …
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