hi

i want to write an integer n into all possible sums ,  i found

Hi

i need help

i want calculate the sum of digits after a comma

Hello

i want to simplify this expression (f@f@...@f@f)(x)

f is repeated "n" times

e.g: for n=3

we found (f@f@f)(x) .

help me please.

Hello .

I need your help please .

how can i solve this kind of equations like : 61*a^2+1=b^2

hello everybody

I need help please

in some forum i found this problem

find a number "abcdefghijklmnopqrstuvwxyzâôîé" with 30 digits if we renverse it

it will be equal 

(éîôâzyxwvutsrqponmlkjihgfedcba)/4