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nearly the most easy one

use FactorInteger function in mathematica... so fast...

i did it manually. it was so hard for me. i wonder why there are so solvers...

solved it finally... this puzzle is awesome!

I've just solved this chanllenge in a way that is not so good (at least to me)... First I wrote down the first 11 numbers and plotted them. I guessed it increased in an exponential manner and then I wrote an expression that was supposed to approximate the trend. I got 53, so I kept trying numbers ar...

I still have no idea about this challenge. I think I have tried words like 'answer', 'the', 'is', 'this' but still I cannot get the answer. Could anybody give me more hints?

If you know the & operator, this is trivial. But as I'm not native English speaker, I still don't understand 'blank for blank'. ... so could anybody tell me what the answer is in private message? I'll appreciate it.

hey, guys. I solved it by trying XOR from 0 to 255 by programming. Anybody has a better solution?