A340138 - cp's OEIS frontend

A340138 a(1)=0, a(n+1) = the least m not already in the sequence such that the decimal digital root r of a(n-1) is found somewhere among the decimal digits of m.

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

[0, 10, 1, 11, 2, 12, 3, 13, 4, 14, 5, 15, 6, 16, 7, 17, 8, 18, 9, 19, 21, 23, 25, 27, 29, 20, 22, 24, 26, 28, 31, 34, 37, 41, 35, 38, 32, 45, 39, 30, 33, 36, 49, 40, 42, 46, 51, 56, 52, 47, 62, 48, 43, 57, 53, 58, 44, 68, 50, 54, 59, 55, 61, 67, 64, 71, 78, 60]

cp's OEIS Frontend

A340138 a(1)=0, a(n+1) = the least m not already in the sequence such that the decimal digital root r of a(n-1) is found somewhere among the decimal digits of m.

Table of values

List of values

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

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

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