>>Hi everybody,
>>
>>Ok, I was inspired by Peter. Here is a very simple problem, but neverless, let's find out the most elegant solution.
>>
>>There is a table with some sequence unique numbers:
>>
>>1
>>3
>>4
>>8
>>15
>>...
>>
>>No pattern. Your goal would be to find out all missing numbers (of course, only whole numbers).
>>
>>For more advanced, I would make the task more difficult: find out all missing simple (? oops, what's the correct math term?) numbers. The latest problem seems complicated and I don't know solution myself yet...
>
>Nadia, can you elaborate on 'simple numbers'? I really have no clue what you're talking about. An example might suffice.

I meant prime numbers, just didn't know the correct term. E.g. each number has only two dividors (1 and itself).

1
2
3
5
7
11
13
etc.