A364935 - cp's OEIS frontend

A364935 a(1) = 1 and thereafter a(n) = sum of digits of the number from concatenation of a(n-1) on the left with leftmost digit of a(n-1) + k and concatenation on the right with rightmost digit of a(n-1) + k, where k is the number of times a(n-1) has appeared in the sequence.

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

[1, 5, 17, 18, 20, 6, 20, 8, 26, 18, 13, 10, 4, 14, 12, 8, 10, 6, 22, 10, 8, 12, 10, 10, 12, 12, 14, 14, 16, 16, 18, 15, 14, 18, 17, 20, 10, 14, 20, 12, 16, 20, 14, 13, 12, 18, 19, 13, 14, 15, 16, 13, 16, 15, 18, 21, 8, 14, 17, 13, 18, 23, 12, 20, 16, 17, 15, 20, 18, 25, 16, 19, 15, 13]

cp's OEIS Frontend

A364935 a(1) = 1 and thereafter a(n) = sum of digits of the number from concatenation of a(n-1) on the left with leftmost digit of a(n-1) + k and concatenation on the right with rightmost digit of a(n-1) + k, where k is the number of times a(n-1) has appeared in the sequence.

Table of values

List of values

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

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

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