Prime Time 2

Number Theory Level 1

Find the sum of the first 9 9 primes.


The answer is 100.

Alex Segesta by Alex Segesta , 20, USA

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4 solutions

Alex Segesta
Mar 2, 2014

2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 = 100 2+3+5+7+11+13+17+19+23=100

6 Helpful 0 Interesting 0 Brilliant 0 Confused

Are there any faster ways to solve it, like a trick?

David Kim - 7 years, 3 months ago

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There may be, but I doubt it; the prime numbers do not adhere to any simple, predictable pattern.

Lee Wall - 7 years, 3 months ago

isnt 1 a prime

Lalitha Prasida - 7 years, 3 months ago

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No, 1 contains only has one divisor: 1. Primes need to have two divisors 1, and the number itself. However, because that 1 is the number itself, it is not considered prime.

Alex Segesta - 7 years, 3 months ago

1 is neither prime nor composite.

Isabella Amabel - 7 years, 1 month ago

1 is nor a prime neither a composite...Prasida

Khadija Aijaz - 7 years, 2 months ago
Isabella Amabel
Apr 20, 2014

2+3+5+7+11+13+17+19+23 = 100

2 Helpful 0 Interesting 0 Brilliant 0 Confused
S W
Apr 21, 2014

the first 9 prime numbers are 2,3,5,7,11,13,17,19,23 and sum of all is 100.

1 Helpful 0 Interesting 0 Brilliant 0 Confused
Ganesh Kumar
Mar 20, 2014

2+3+5+7+11+13+17+19+23=100. 1 is not a prime number

0 Helpful 0 Interesting 0 Brilliant 0 Confused

here why we should not consider 1 for addition? if 1 is also a prime number??? then why we dont consider to add with the series 2+3+5+7+11+13+17+19+23 ??

Eshwar Vignesh - 6 years, 9 months ago

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