Glaisher's theorem

Glaisher's theorem

In number theory, Glaisher's theorem is an identity useful to the study of integer partitions. It is named for James Whitbread Lee Glaisher.

It states that the number of partitions of an integer N into parts not divisible by d is equal to the number of partitions of the form:N=N_1+cdots+N_kwhere N_igeq N_{i+1} and N_igeq N_{i+d-1}+1,that is, partitions in which no part is repeated "d" or more times.

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