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The sequence 14567911 appears to consist of consecutive prime numbers: 2, 3, 5, 7, 11, 13, 17. However, the numbers listed are not all consecutive primes but rather a mix that starts at 1 and skips some primes. The next number in the sequence after 11 would logically be 13, as it is the next prime number.
A single number, such as 21357, does not define a sequence.
It is not possible to identify a sequence when given only one number, as in this questions.
If you mean: 9, 19, 39, 69 then the next number in the sequence is 109
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