A130180 - cp's OEIS frontend

A130180 Number of numbers k > 1 such that (sum of digits of k^n)*(sum of digits of k^(n+1)) = k.

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

[5, 3, 12, 2, 6, 8, 4, 1, 13, 8, 7, 14, 8, 3, 9, 1, 5, 12, 4, 0, 13, 4, 7, 7, 1, 4, 7, 2, 5, 8, 2, 4, 8, 7, 1, 10, 5, 2, 8, 4, 2, 10, 2, 6, 10, 2, 3, 6, 2, 4, 4, 2, 3, 9, 2, 3, 8, 1, 3, 8, 5, 3, 6, 4, 6, 8, 4, 3, 10, 0, 1, 6, 3, 6, 6, 4, 2, 7, 2, 1]

cp's OEIS Frontend

A130180 Number of numbers k > 1 such that (sum of digits of k^n)*(sum of digits of k^(n+1)) = k.

Table of values

List of values

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

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

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