Question

here on earth our 24 hour day is composed of two parts, each of 12 hours.each hour in each part has a corresponding hour in other part separated by 12 hours.the hour essentially measures the duration since the start of the day part. for example, 1 hour in first part of the day is equivalent to 13. which is 1 hour in to second part of the day.
now consider the equivalent hours that are both prime numbers, we have 3 such instances for a 24 hours 2 part day 5~17
7~19
11~23 accept two natural numbers D,p>1

Answer 1

Answer:

Find all prime in O(n) then out it into TreeMap and then just take loop from first prime to end and look whethere prime+d/p is avaible in map or not .

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