In Mathematics
Although a number of the form 2n - 1, 63 is not a Mersenne prime since n is not prime and 63 is certainly not prime either. It is a Woodall number and a Harshad number. It is a highly cototient number. It is a repdigit in bases 2 (111111), 4 (333), and 8 (77).
Read more about this topic: 63 (number)
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