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A Proth number is a natural number of the form:
- $N = k \times 2^n + 1$
The condition is included, otherwise every odd integer greater than $1$ would be a Proth number.
- $3, 5, 9, 13, 17, 25, 33, 41, 49, 57, 65, \ldots$
Source of Name
This entry was named for François Proth.