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63 (sixty-three) is a natural number following 62 and preceding 64. ==In mathematics== 63 is a deficient composite number with an aliquot sum of 41. It also a highly cototient number. It is a number of the form 2n - 1 (with n=6), but it is not a Mersenne prime since n is not prime and 63 is certainly not prime either. It is also a Woodall number i.e. of the form n *2n - 1 with n=4. It is the third Delannoy number. It is the smallest whole number that can be divided by any number from 1 to 9 without repeating decimals. It is the sum of the powers of 2 from 0 to 5, equivalently it is a repdigit in bases 2 (111111), 4 (333), and 8 (77). In base 10 it is a Harshad number. 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「63 (number)」の詳細全文を読む スポンサード リンク
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