Sum of n primes

Number Theory Level 3

Can the sum of 5 primes ever be 25

Yes No

Triambika Garg by TRIAMBIKA GARG , 17, India

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3 solutions

Barry Leung
Mar 13, 2019

− 1 + 3 + 5 + 7 + 11 = 25 -1+3+5+7+11=25 this is a wrong solution since 1 is not a prime. And I forgot about that XD.

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1 is not a prime

TRIAMBIKA GARG - 2 years, 3 months ago

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oh ohohohoho :)

Barry Leung - 2 years, 3 months ago
Chakravarthy B
Mar 6, 2019

2+3+7+11+2=25

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2 + 2 + 2 + 2 + 17 = 25 2+2+2+2+17=25

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Why not just 5 + 5 + 5 + 5 + 5 5+5+5+5+5 ?

Joshua Lowrance - 2 years, 3 months ago

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you know, sometimes it is so easy not to see the obvious, so that only 33% (at the time this comment is made) of people get the right answer :)

A Former Brilliant Member - 2 years, 3 months ago

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Very true! I missed this problem because I thought that we couldn't use the same prime more than once. So great job getting this problem right!

Joshua Lowrance - 2 years, 3 months ago

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