A175398 - cp's OEIS frontend

A175398 Sequence of resulting numbers after iterations of {((((D_1^D_2)^D_3)^D_4)^... )^D_k, where D_k is the k-th digit D of the number r and k is the digit number of the number r in the decimal expansion of r (A055642)} needed to reach a one-digit number starting at r = n.

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	1
11	1
12	1
13	1
14	1
15	1
16	1
17	1
18	1
19	1
20	1
21	2
22	4
23	8
24	1
25	9
26	1
27	1
28	1
29	9
30	1
31	3
32	9
33	1
34	8
35	1
36	1
37	1
38	1
39	1
40	1
41	4
42	1
43	1
44	1
45	1
46	1
47	1
48	1
49	1
50	1

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 4, 8, 1, 9, 1, 1, 1, 9, 1, 3, 9, 1, 8, 1, 1, 1, 1, 1, 1, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1]

cp's OEIS Frontend

A175398 Sequence of resulting numbers after iterations of {((((D_1^D_2)^D_3)^D_4)^... )^D_k, where D_k is the k-th digit D of the number r and k is the digit number of the number r in the decimal expansion of r (A055642)} needed to reach a one-digit number starting at r = n.

Table of values

List of values

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	1
11	1
12	1
13	1
14	1
15	1
16	1
17	1
18	1
19	1
20	1
21	2
22	4
23	8
24	1
25	9
26	1
27	1
28	1
29	9
30	1
31	3
32	9
33	1
34	8
35	1
36	1
37	1
38	1
39	1
40	1
41	4
42	1
43	1
44	1
45	1
46	1
47	1
48	1
49	1
50	1

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	1
11	1
12	1
13	1
14	1
15	1
16	1
17	1
18	1
19	1
20	1
21	2
22	4
23	8
24	1
25	9
26	1
27	1
28	1
29	9
30	1
31	3
32	9
33	1
34	8
35	1
36	1
37	1
38	1
39	1
40	1
41	4
42	1
43	1
44	1
45	1
46	1
47	1
48	1
49	1
50	1

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	1
11	1
12	1
13	1
14	1
15	1
16	1
17	1
18	1
19	1
20	1
21	2
22	4
23	8
24	1
25	9
26	1
27	1
28	1
29	9
30	1
31	3
32	9
33	1
34	8
35	1
36	1
37	1
38	1
39	1
40	1
41	4
42	1
43	1
44	1
45	1
46	1
47	1
48	1
49	1
50	1