CB Number Concept

Could someone clarify as to what CB number actually is. Rule 2 lists the no. of Prime nos, which are already to be considered CB numbers.
Rule 3 states that a number NOT divisible by any of the numbers is to be considered a CB no.

But for the sample input provided for the same, 81615, shouldn’t the output be 3, since 8161 is only divisible by 1 and itself?

@Neejor-Chakma-171774404173395
81615 can be at max split into two CB numbers 8161 and 5. So the answer is 2.
How according to you output is 3?

The sample output provided for 81615 is 2. But the explanation considers 61 and 5. 8161, along with these 2 should make it 3, right?

@Neejor-Chakma-171774404173395 hey in this case 61 is considered in 8161 and 61 we can consider one position only once.
If this resolves your doubt mark it as resolved.

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