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Primes numbers are scary

Do you know that the sum of digits of first \( 100 \) \(prime \) \( numbers \) is \(1111\).

Can anyone tell me how to calculate that ?

Note by Akshat Sharda
1 year, 10 months ago

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You can write a program to calculate it. I used Python and it is as follows. Note that p is a list of at least the first 100 primes.

 p = [2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,101,103,107,109,113,127,131,

 s = ''
 for i in range(100):
      s += str(p[i])

 sum = 0    
 for j in range(len(s)):
      sum += int(s[j])

 print sum
Chew-Seong Cheong · 1 year, 10 months ago

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@Chew-Seong Cheong Sir , is there any other way to do it ? I don't know about Python or something like that. Akshat Sharda · 1 year, 10 months ago

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@Akshat Sharda I don't think so or else we can predict the occurrence of primes, which we can't. Chew-Seong Cheong · 1 year, 10 months ago

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Do you know that- 1 +12+123+1234......+123456789+9+98+987.......+987654321= 1234567890.........

imagine incredible maths Guneet Singh Oberai · 1 year, 10 months ago

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@Guneet Singh Oberai \(Wow!!\) Akshat Sharda · 1 year, 10 months ago

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Curiously enough, the number of triangles in a straight-edge \(K_6\) graph is \(111\). (See here)

Coincidental numbers appear everywhere! Daniel Liu · 1 year, 10 months ago

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I think you can use the Arithmetic Series . search it :D Ryan Ken Lelis · 1 year, 10 months ago

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