A277495 - cp's OEIS frontend

A277495 a(1) = 1; a(n) = n if a(n-1) = 1; otherwise, a(n) = digit sum (n written in base a(n-1)).

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

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

cp's OEIS Frontend

A277495 a(1) = 1; a(n) = n if a(n-1) = 1; otherwise, a(n) = digit sum (n written in base a(n-1)).

Table of values

List of values

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

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

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