A175419 - cp's OEIS frontend

A175419 The single-digit number obtained by iterated mapping of r (starting with n) to a power-tower of its digits, or -1 if such a single-digit number is never reached.

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	0
11	1
12	2
13	3
14	4
15	5
16	6
17	7
18	8
19	9
20	0
21	1
22	4
23	9
24	6
25	-1
26	-1
27	1
28	1
29	1
30	0
31	1
32	8
33	1
34	1
35	-1
36	-1
37	1
38	8
39	1
40	0
41	1
42	6
43	1
44	1
45	1
46	1
47	1
48	1
49	1
50	0
51	1
52	8
53	1
54	1
55	1
56	1
57	1
58	1
59	1
60	0
61	1
62	1
63	1
64	1
65	1
66	1
67	1
68	1
69	1
70	0
71	1
72	1
73	1
74	1
75	1
76	1
77	1
78	1
79	1
80	0
81	1
82	1
83	1
84	1
85	1
86	1
87	1
88	1
89	1
90	0
91	1
92	8
93	1
94	1
95	1
96	1
97	1
98	1
99	1
100	1

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

cp's OEIS Frontend

A175419 The single-digit number obtained by iterated mapping of r (starting with n) to a power-tower of its digits, or -1 if such a single-digit number is never reached.

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	0
11	1
12	2
13	3
14	4
15	5
16	6
17	7
18	8
19	9
20	0
21	1
22	4
23	9
24	6
25	-1
26	-1
27	1
28	1
29	1
30	0
31	1
32	8
33	1
34	1
35	-1
36	-1
37	1
38	8
39	1
40	0
41	1
42	6
43	1
44	1
45	1
46	1
47	1
48	1
49	1
50	0
51	1
52	8
53	1
54	1
55	1
56	1
57	1
58	1
59	1
60	0
61	1
62	1
63	1
64	1
65	1
66	1
67	1
68	1
69	1
70	0
71	1
72	1
73	1
74	1
75	1
76	1
77	1
78	1
79	1
80	0
81	1
82	1
83	1
84	1
85	1
86	1
87	1
88	1
89	1
90	0
91	1
92	8
93	1
94	1
95	1
96	1
97	1
98	1
99	1
100	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	0
11	1
12	2
13	3
14	4
15	5
16	6
17	7
18	8
19	9
20	0
21	1
22	4
23	9
24	6
25	-1
26	-1
27	1
28	1
29	1
30	0
31	1
32	8
33	1
34	1
35	-1
36	-1
37	1
38	8
39	1
40	0
41	1
42	6
43	1
44	1
45	1
46	1
47	1
48	1
49	1
50	0
51	1
52	8
53	1
54	1
55	1
56	1
57	1
58	1
59	1
60	0
61	1
62	1
63	1
64	1
65	1
66	1
67	1
68	1
69	1
70	0
71	1
72	1
73	1
74	1
75	1
76	1
77	1
78	1
79	1
80	0
81	1
82	1
83	1
84	1
85	1
86	1
87	1
88	1
89	1
90	0
91	1
92	8
93	1
94	1
95	1
96	1
97	1
98	1
99	1
100	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	0
11	1
12	2
13	3
14	4
15	5
16	6
17	7
18	8
19	9
20	0
21	1
22	4
23	9
24	6
25	-1
26	-1
27	1
28	1
29	1
30	0
31	1
32	8
33	1
34	1
35	-1
36	-1
37	1
38	8
39	1
40	0
41	1
42	6
43	1
44	1
45	1
46	1
47	1
48	1
49	1
50	0
51	1
52	8
53	1
54	1
55	1
56	1
57	1
58	1
59	1
60	0
61	1
62	1
63	1
64	1
65	1
66	1
67	1
68	1
69	1
70	0
71	1
72	1
73	1
74	1
75	1
76	1
77	1
78	1
79	1
80	0
81	1
82	1
83	1
84	1
85	1
86	1
87	1
88	1
89	1
90	0
91	1
92	8
93	1
94	1
95	1
96	1
97	1
98	1
99	1
100	1