Emirps

Number Theory Level 2

What is the sum of the first 10 emirps ?

And, for this problem, you have to count both 13 and 31(These are an example of the emirps.) to the problem. (Then, total of 5 pairs of emirps exist for this problem.)

Emirp is a prime number that exchanges its values(like 13 becomes 31.), it is also prime, but not reversible primes.


The answer is 638.

. . by . . , 14, South Korea

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1 solution

. .
Mar 29, 2021

The first 10 emirps are 13, 17, 31, 37, 71, 73, 79, 97, 107, 113.

So, 13 + 17 + 31 + 37 + 71 + 73 + 79 + 97 + 107 + 113 = 638 13 + 17 + 31 + 37 + 71 + 73 + 79 + 97 + 107 + 113 = \boxed { 638 } .

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Well the answer right there in the link in the question

Omek K - 2 months, 2 weeks ago

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I know it, but I got these for the example.

. . - 2 months, 1 week ago

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