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Are you sure? It doesn't seem possible without reducing it to a First Order DE.
I agree. We should wait for OP to verify which interpretation of the problem is correct.
Hi MIF
The page is awesome! I can't find anything wrong or missing.
But, I think we are supposed to find the sum of the squares of the digits of N_b.
Hi Bob
I'm not sure what you did, so I think it would be the easiest to explain how you got 5 for b=2. I am getting 2.
Because you cannot do it in the general case.
Also, I just figured out that Bob posted the expression for the sum. But, that unfortunately tell us nothing about the digits, though.
Hi bobbym
The remainder of the question is in post #3.
But, you need the squares of the digits...
Hi chooipian
Hm, it seems that's how you did it. Didn't see that there were your answers beneath the questions. I'll look at Q2.
Hi chooipian
For Q1, you can just write out all the numbers.
There are also grandpappyd and grandmammyd.
I wonder why I was linking both of you to Europe. I think I know, but I'm not sure.
Was pappym born in Europe?
Weren't you born in Europe?
Hi bobbym
Hi bobbym
I come from NY.
Hmmm?