Why 7 11 13 and 7 6 5 4 3 2 1 5 are composite numbers?

Excuse me, could you please clarify your statement? The numbers you've mentioned, 7, 11, 13, and the sequence 7, 6, 5, 4, 3, 2, 1, 5, do not all fit the definition of composite numbers. In fact, 7, 11, and 13 are prime numbers, as they have only two distinct positive divisors: 1 and themselves. Composite numbers, on the other hand, are positive integers greater than 1 that have more than two positive divisors. None of the individual numbers you listed as "composite" actually meet this criteria. Could you perhaps be referring to a misunderstanding or a specific mathematical context where these numbers are being used in a non-standard way? I'd be happy to help clarify further if you could provide more context.