You can do it all with conditional formatting but you will need to set 8 rules, a rule for each number.
It depends on what type of arrows you require.
ALT 30 and ALT 31 are up - down arrows, if you want different arrows find the alt code
for those arrows.
I will show 1 rule for the first number 1 then continue in a like manner for the rest of
your numbers. Use ALT 30 for the Up arrow for even numbers
First select all the range of the numbers you wish to format > select conditional
formatting > select "Use a formula..." > type in =A1=1 (if that is the
first cell in your selected range) > click format > click fill > click red > click number >
click custom > in the type box highlight the general then while holding down the ALT key type 31 and 3 spaces
followed by the Hash symbol (you should now see an downwards triangle and a number in the sample box)
Click OK > Click apply.