Question 57

Sum of all the prime numbers between 1 and 60 having 3 as the unit digit is

Solution

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The numbers between 1 and 60 ending in 3 are 3, 13, 23, 33, 43 and 53. All are prime except $$33 = 3 \times 11$$. Their sum is $$3 + 13 + 23 + 43 + 53 = 135$$.

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