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The previous number!
Each number is half the previous number.
The previous prime number is 23,456,787,559 and the next prime number is 23,456,787,593.
Each number is 0.2 times the previous number.
Given any random digit, there is a 10% probability that the next digit is the same. That is, the probability of the previous number repeating is 10%. Whether this constitutes often (as suggested by the question) or not is a matter of opinion.