The pattern of three repeats for every four numbers
34k+1
|
34k+2
|
34k+3
|
34k
|
31=3
|
32=9
|
33=27
|
34=81
|
35=243
|
36=729
|
37=2187
|
38=6561
|
39=19683
|
310=59049
|
311=177147
|
312=531441
|
313=-----3
| 314=-------9 | 315=-------7 | 316=------1 |
3 is the units digit of 3
1 3
5 3
9 3
13 3
4n+1
9 is the units digit of 32 36 310 314 34n+2
7 is the units digit of 33 37 311 315 34n+3
1 is the units digit of 34 38 312 316 34n