Project Euler Forum

@echip
I don't know what you mean by saying 'Unlucky's site'. If you think anything is inappropriate, just tell me instead of saying something ambiguous and making arbitrary judgments or guesses about me.

Solving almost all problem seems not difficult for me now, since I started my journey from most hardest problems. I don't want to judge people using strong criteria, but I'm only interested in learning knowledge and sharing my ideas with others. Anyway, thanks for your answer and I'll take it easy.

I see. Thanks. Is there any criterion for a person to be asked to join you, such as recommendation, performance, innovation, etc.?

I'd like to ask how someone can join the problem development team? Is there any information about that? I'm quite interested.

As an epicyclic gear train allows the planets to rotate, what is the meaning of perfectly meshing of gears? Could you show how to drive the whole system? Thanks.