hodder number
A hodder number is one that is prime and is equal to 2j-1 for some j. For example, 31 is a hodder number because 31 is prime and is equal to 25-1 (in this case j = 5). The first 4 hodder numbers are 3 阅读更多
A hodder number is one that is prime and is equal to 2j-1 for some j. For example, 31 is a hodder number because 31 is prime and is equal to 25-1 (in this case j = 5). The first 4 hodder numbers are 3 阅读更多