Project Euler Forum

From what I gather from the problem description, the outcome of s(n) is 0 if n is odd, else some value > 0. Is this right?

From the problem description: So if $n$ is odd $s(n)$ is not defined.

Thanks

Really interesting little problem (imho 15% is a bit low)
In the mean time I know exactly what the maximum deck size for s(n) = 60 is, or any other amount of shuffles for that matter, (No, you can't shuffle this deck by hand or even forklift ) but the decks in between are still a mistery to me.

You really could've asked for s(n)=31

Can you tell me the how many digits has answer?

Jochen_P wrote: Mon Jan 07, 2019 7:47 am In the mean time I know exactly what the maximum deck size for s(n) = 60 is, or any other amount of shuffles
for that matter, ... but the decks in between are still a mistery [sic] to me.

"In between" well said; the minimum deck size is also conspicuous...

can help me and say what is the largest number that s(n) = 60

I presume a "riffle" shuffle is the same as a "perfect" shuffle (first statement of third paragraph). Pet peeve of mine - calling something x, then later y ...
No one else complained so I also presume I'm nitpicking.

PS. Looked it up - and a "perfect riffle" shuffle is what is described in the first paragraph.