Now you can see the base value which is 2*2*3*4*5 is common in both values, now you can find the prime numbers easily from 20 to 40. Total No of prime numbers between 20 to 40 = Total No of prime numbers between 260 to 280Ģ60 and 280 can be expressed as product of smallest possible integers plus smallest possible integer.īecause i know exactly what are the prime numbers less than 100, which makes problem easy for me.Ģ60 can be expressed in smallest possible integers as 2*2*3*4*5+20Īnd 280 can be expressed as in smallest possible integers as 2*2*3*4*5+40. Nut unfortunately I am not able to recall that approach.Īs you just calculate the prime no.s between 20 and 40 Sorry to say but I didn't got your approach.Īctually, I have seen an approach in which big numbers are given eg- 737 to 943 (Just a random range)Īnd then we break these no into something.In the end we get an range which is below 100 and we just need to calculate the prime no between them. ![]() Hence, a prime numberĢ77 - not divisible by any prime numbers up to 16. Hence, a prime numberĢ71 - not divisible by any prime numbers up to 16. ![]() Hence, a prime numberĢ69 - not divisible by any prime numbers up to 16. 2, 3, 5, 7, 11, and 13).Ģ63 - not divisible by any prime numbers up to 16. ![]() ![]() How many prime numbers exist between 260 and 280?Īs 280 lies between 16^2 (256) and 17^2 (289), we need to check divisibility of each of the numbers between 260 and 280 by prime numbers up to 16 (i.e.
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