A259043 - cp's OEIS frontend

A259043 a(n) = if n < 10 then n else a(floor(n/10) + n mod 10) + n mod 10.

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

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 3, 5, 7, 9, 11, 13, 15, 17, 10, 2, 4, 6, 8, 10, 12, 14, 16, 9, 12, 3, 5, 7, 9, 11, 13, 15, 8, 11, 14, 4, 6, 8, 10, 12, 14, 7, 10, 13, 16, 5, 7, 9, 11, 13, 6, 9, 12, 15, 18, 6, 8, 10, 12, 5, 8, 11, 14, 17, 20, 7, 9, 11, 4, 7]

cp's OEIS Frontend

A259043 a(n) = if n < 10 then n else a(floor(n/10) + n mod 10) + n mod 10.

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

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

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