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Problem Of The Week 41

with 3 comments


Let s(p) be the sum of digits of a prime p. If p-s(p) is also a prime, then we call the prime a primal, how many primals below 100 are there ?

Written by Implex

October 3, 2008 at 3:37 pm

3 Responses

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  1. Zero
    10x+y-(x+Y)
    9x
    cannot be a prime

    tyro

    October 3, 2008 at 3:58 pm

  2. nicely done !!

    outtimed

    October 3, 2008 at 4:14 pm

  3. wah tyro ne bhi solve kar diya..

    Varun

    October 3, 2008 at 7:13 pm


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