1, 3, 9, 41, 123 and 369.
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369 is composite because 3 and possibly other numbers besides 1 and 369 are factors of 369.
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Any of the infinite set of numbers of the form k*369 where k is any integer. For example 36900369000000369
Oh, what a delightful question! In the world of numbers and possibilities, you can place any number in the middle of 3, 6, and 9 to create new combinations like 3369, 3669, or even 3999. Let your imagination guide you as you explore the endless beauty of numbers and their harmonious relationships.