A341817 - cp's OEIS frontend

A341817 If a(n) is odd, add to a(n) its odd digits and iterate; if a(n) is even, add to a(n) its even digits and iterate; if an iteration reproduces a term already in the sequence, don't do this iteration and extend the sequence with the smallest integer not yet present in the sequence.

n	a(n)
1	1
2	2
3	4
4	8
5	16
6	22
7	26
8	34
9	38
10	46
11	56
12	62
13	70
14	3
15	6
16	12
17	14
18	18
19	5
20	10
21	7
22	9
23	11
24	13
25	17
26	25
27	30
28	15
29	21
30	19
31	29
32	20
33	23
34	24
35	27
36	28
37	31
38	35
39	43
40	32
41	33
42	39
43	51
44	57
45	69
46	78
47	86
48	100
49	36
50	42
51	48
52	60
53	66
54	37
55	47
56	54
57	58
58	40
59	44
60	52
61	41
62	45
63	50
64	49
65	53
66	61
67	55
68	65
69	59
70	73
71	83
72	63
73	64
74	74
75	67
76	68
77	82
78	92

[1, 2, 4, 8, 16, 22, 26, 34, 38, 46, 56, 62, 70, 3, 6, 12, 14, 18, 5, 10, 7, 9, 11, 13, 17, 25, 30, 15, 21, 19, 29, 20, 23, 24, 27, 28, 31, 35, 43, 32, 33, 39, 51, 57, 69, 78, 86, 100, 36, 42, 48, 60, 66, 37, 47, 54, 58, 40, 44, 52, 41, 45, 50, 49, 53, 61, 55, 65, 59, 73, 83, 63, 64, 74, 67, 68, 82, 92]

cp's OEIS Frontend

A341817 If a(n) is odd, add to a(n) its odd digits and iterate; if a(n) is even, add to a(n) its even digits and iterate; if an iteration reproduces a term already in the sequence, don't do this iteration and extend the sequence with the smallest integer not yet present in the sequence.

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	8
5	16
6	22
7	26
8	34
9	38
10	46
11	56
12	62
13	70
14	3
15	6
16	12
17	14
18	18
19	5
20	10
21	7
22	9
23	11
24	13
25	17
26	25
27	30
28	15
29	21
30	19
31	29
32	20
33	23
34	24
35	27
36	28
37	31
38	35
39	43
40	32
41	33
42	39
43	51
44	57
45	69
46	78
47	86
48	100
49	36
50	42
51	48
52	60
53	66
54	37
55	47
56	54
57	58
58	40
59	44
60	52
61	41
62	45
63	50
64	49
65	53
66	61
67	55
68	65
69	59
70	73
71	83
72	63
73	64
74	74
75	67
76	68
77	82
78	92

n	a(n)
1	1
2	2
3	4
4	8
5	16
6	22
7	26
8	34
9	38
10	46
11	56
12	62
13	70
14	3
15	6
16	12
17	14
18	18
19	5
20	10
21	7
22	9
23	11
24	13
25	17
26	25
27	30
28	15
29	21
30	19
31	29
32	20
33	23
34	24
35	27
36	28
37	31
38	35
39	43
40	32
41	33
42	39
43	51
44	57
45	69
46	78
47	86
48	100
49	36
50	42
51	48
52	60
53	66
54	37
55	47
56	54
57	58
58	40
59	44
60	52
61	41
62	45
63	50
64	49
65	53
66	61
67	55
68	65
69	59
70	73
71	83
72	63
73	64
74	74
75	67
76	68
77	82
78	92

n	a(n)
1	1
2	2
3	4
4	8
5	16
6	22
7	26
8	34
9	38
10	46
11	56
12	62
13	70
14	3
15	6
16	12
17	14
18	18
19	5
20	10
21	7
22	9
23	11
24	13
25	17
26	25
27	30
28	15
29	21
30	19
31	29
32	20
33	23
34	24
35	27
36	28
37	31
38	35
39	43
40	32
41	33
42	39
43	51
44	57
45	69
46	78
47	86
48	100
49	36
50	42
51	48
52	60
53	66
54	37
55	47
56	54
57	58
58	40
59	44
60	52
61	41
62	45
63	50
64	49
65	53
66	61
67	55
68	65
69	59
70	73
71	83
72	63
73	64
74	74
75	67
76	68
77	82
78	92