Ok, this isn't an answer... just some guessing, and randomness...
5n+42n+1
47n+1
ok so that thing simplified is 47n+1
then my brilliant idea is to get stuck. Somebody help....
EDIT: k, plug in numbers..... start with one
47+1=48
48 is divisible by 8.
next one: 95
um 95 isnt divisible by 8.... uhh what? did i do wrong...
+24 
