If you take 10 and factorise it we get 10 = 2 x 5. Now if we add - TopicsExpress



          

If you take 10 and factorise it we get 10 = 2 x 5. Now if we add the primes from 2 to 5 we get 2+3+5 = 10 the same number. The next such number with this property is 39. Observe that 39 = 3 x 13 and if we add all the primes from 3 to 13 we get 3+5+7+11+13 = 39. Can you find next two numbers with this interesting property? i.e. If a number is expressed as product of two primes say p and q, where p is less than q, and if we add all primes from p to q, we should get the number. There is literally no end to such curious and astonishing properties exhibited by natural numbers. Pie Mathematics Association.
Posted on: Tue, 15 Oct 2013 10:13:07 +0000

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