A140100 - cp's OEIS frontend

A140100 Start with Y(0)=0, X(1)=1, Y(1)=2. For n > 1, choose least positive integers Y(n) > X(n) such that neither Y(n) nor X(n) appear in {Y(k), 1 <= k < n} or {X(k), 1 <= k < n} and such that Y(n) - X(n) does not appear in {Y(k) - X(k), 1 <= k < n} or {Y(k) + X(k), 1 <= k < n}; sequence gives X(n) (for Y(n) see A140101).

n	a(n)
1	1
2	3
3	4
4	6
5	7
6	9
7	10
8	12
9	14
10	15
11	17
12	18
13	20
14	21
15	23
16	24
17	26
18	27
19	29
20	30
21	32
22	34
23	35
24	37
25	38
26	40
27	41
28	43
29	44
30	46
31	47
32	49
33	51
34	52
35	54
36	55
37	57
38	58
39	60
40	61
41	63
42	64
43	66
44	67
45	69
46	71
47	72
48	74
49	75
50	77
51	78
52	80
53	82
54	83
55	85
56	86
57	88
58	89
59	91
60	92
61	94
62	95
63	97
64	98
65	100
66	102
67	103
68	105
69	106

[1, 3, 4, 6, 7, 9, 10, 12, 14, 15, 17, 18, 20, 21, 23, 24, 26, 27, 29, 30, 32, 34, 35, 37, 38, 40, 41, 43, 44, 46, 47, 49, 51, 52, 54, 55, 57, 58, 60, 61, 63, 64, 66, 67, 69, 71, 72, 74, 75, 77, 78, 80, 82, 83, 85, 86, 88, 89, 91, 92, 94, 95, 97, 98, 100, 102, 103, 105, 106]

cp's OEIS Frontend

Table of values

List of values

n	a(n)
1	1
2	3
3	4
4	6
5	7
6	9
7	10
8	12
9	14
10	15
11	17
12	18
13	20
14	21
15	23
16	24
17	26
18	27
19	29
20	30
21	32
22	34
23	35
24	37
25	38
26	40
27	41
28	43
29	44
30	46
31	47
32	49
33	51
34	52
35	54
36	55
37	57
38	58
39	60
40	61
41	63
42	64
43	66
44	67
45	69
46	71
47	72
48	74
49	75
50	77
51	78
52	80
53	82
54	83
55	85
56	86
57	88
58	89
59	91
60	92
61	94
62	95
63	97
64	98
65	100
66	102
67	103
68	105
69	106

n	a(n)
1	1
2	3
3	4
4	6
5	7
6	9
7	10
8	12
9	14
10	15
11	17
12	18
13	20
14	21
15	23
16	24
17	26
18	27
19	29
20	30
21	32
22	34
23	35
24	37
25	38
26	40
27	41
28	43
29	44
30	46
31	47
32	49
33	51
34	52
35	54
36	55
37	57
38	58
39	60
40	61
41	63
42	64
43	66
44	67
45	69
46	71
47	72
48	74
49	75
50	77
51	78
52	80
53	82
54	83
55	85
56	86
57	88
58	89
59	91
60	92
61	94
62	95
63	97
64	98
65	100
66	102
67	103
68	105
69	106

n	a(n)
1	1
2	3
3	4
4	6
5	7
6	9
7	10
8	12
9	14
10	15
11	17
12	18
13	20
14	21
15	23
16	24
17	26
18	27
19	29
20	30
21	32
22	34
23	35
24	37
25	38
26	40
27	41
28	43
29	44
30	46
31	47
32	49
33	51
34	52
35	54
36	55
37	57
38	58
39	60
40	61
41	63
42	64
43	66
44	67
45	69
46	71
47	72
48	74
49	75
50	77
51	78
52	80
53	82
54	83
55	85
56	86
57	88
58	89
59	91
60	92
61	94
62	95
63	97
64	98
65	100
66	102
67	103
68	105
69	106