A226135 - cp's OEIS frontend

A226135 Let abcd... be the decimal expansion of n. Number of iterations of the map n -> f(n) needed to reach a number < 10, where f(n) = a^b + c^d + ... which ends in an exponent or a base according as the number of digits is even or odd.

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

[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 5, 2, 21, 2, 1, 1, 1, 3, 2, 3, 6, 8, 19, 6, 1, 1, 2, 5, 21, 3, 4, 12, 17, 4, 1, 1, 3, 2, 3, 5, 4, 15, 4, 3, 1, 1, 7, 2, 4, 14, 16, 4, 16, 4, 1, 1, 5, 6, 3, 2, 5, 11, 13, 15, 1, 1, 5]

cp's OEIS Frontend

A226135 Let abcd... be the decimal expansion of n. Number of iterations of the map n -> f(n) needed to reach a number < 10, where f(n) = a^b + c^d + ... which ends in an exponent or a base according as the number of digits is even or odd.

Table of values

List of values

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

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

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