What makes #100 special?

[Herman]

Reference: New Scientist NL.

 

[Irene McC]

Are we missing a link (the missing link, har har) - what does this refer to?

 

[Herman]

It's a dutch magazine about science.

100 is the sum of 9 numbers, which numbers?

 

[mike3996]

9 numbers or digits? Do they need to be unique (ie. use each only once)?

 

[Herman]

Yip @mike3996 , unique numbers, each one only once
The first numer is 2

 

[bdbits]

If I added correctly, that would be the sum of primes 2 through 23.
2,3,5,7,11,13,17,19,23

 

[Herman]

@bdbits well done, congrats!

 

[Herman]

100
1+0+0=1
100/1=100
Please another number which allows doing same as 100, thanks!

 

[mike3996]

100
1+0+0=1
100/1=100
Please another number which allows doing same as 100, thanks!

1
10
100
1000
10000
....

 

[Herman]

Right @mike3996

Looking for a number under 100

 

[Herman]

For example 21
2+1=3
21:3=7

Another number plse!

 

[Herman]

It starts with a 2

 

[bdbits]

Are you asking for where the number divided by the sum of its digits is the number?
I built a spreadsheet to do this for the numbers 10 through 100 and only 10 and 100 seemed to work.
But then again, my math skills are a little rusty.

 

[Herman]

Thanks @bdbits for your reply.
It's
27
2+7=9
27/9=3