The pattern of two repeats for every four numbers
24k+1
|
24k+2
|
24k+3
|
24k
|
21=2
|
22=4
|
23=8
|
24=16
|
25=32
|
26=64
|
27=128
|
28=216
|
29=512
|
210=1024
|
211=2048
|
212=4096
|
213=8192
| 214=16384 | 215=32768 | 216=65536 |
2 is the units digit of 2
1 2
5 2
9 2
13 2
4n+1
4 is the units digit of 22 26 210 214 24n+2
8 is the units digit of 23 27 211 215 24n+3
6 is the units digit of 24 28 212 216 24n