jukka, I thought I had it too. But it doesn't work with the last number 172, I get it to something else am I missing something?

Edit:Nevermind, I got it now

well i dunno about the nevermind, but when i first posted, i thought i had got it with adding the numbers via

u[n] = (n-1)(u[n-1]+u[n-2])

i.e

u[3] = 2*(2+3) = 10

u[4] = 3*(10+3) = 39

u[5] = 4*(39+10) = 186 =/= 172, and then i realised it was wrong

so what is the answer

]]>**Edit:** Nevermind, I got it now

If u still havent found what u are looking for:

SPOILER!!!

Try to add two of numbers with eachother...

]]>2,3,10,39,172,?

what will be the next no.?and how?

ive tried loads of things, but im stumped

]]>what will be the next no.?and how?]]>