26, 52, 78 and so on.
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26, 52, 78 for example.
Itself and any multiples of 26
Any multiple of 416.
All multiples of 26, which is an infinite number. They include 26, 52, 78, 104, 130, 156 . . .
The multiples of 13 from 1 to 100 are: 13, 26, 39, 52, 65, 78, 91.