A280875 - cp's OEIS frontend

A280875 Set a(1)=0, a(2)=1, a(3)=3; b(1)=1, b(2)=2; c(1)=3. Thereafter, a(n) is the smallest positive integer m such that m is not yet in sequence a, m-a(n-1) is not yet in sequence b, and m-a(n-2) is not yet in sequence c; set b(n-1)=m-a(n-1), c(n-2)=m-a(n-2).

n	a(n)
1	0
2	1
3	3
4	2
5	5
6	9
7	4
8	13
9	10
10	6
11	18
12	11
13	16
14	7
15	25
16	17
17	15
18	28
19	12
20	19
21	27
22	8
23	14
24	24
25	35
26	49
27	20
28	37
29	52
30	21
31	44
32	33
33	23
34	47
35	41
36	29
37	54
38	70
39	22
40	42
41	61
42	36
43	78
44	31
45	53
46	74
47	30
48	57
49	83
50	26
51	56
52	84
53	32
54	64
55	51
56	34
57	71
58	100
59	38
60	81
61	60
62	40
63	86
64	63
65	39
66	87
67	69
68	43

[0, 1, 3, 2, 5, 9, 4, 13, 10, 6, 18, 11, 16, 7, 25, 17, 15, 28, 12, 19, 27, 8, 14, 24, 35, 49, 20, 37, 52, 21, 44, 33, 23, 47, 41, 29, 54, 70, 22, 42, 61, 36, 78, 31, 53, 74, 30, 57, 83, 26, 56, 84, 32, 64, 51, 34, 71, 100, 38, 81, 60, 40, 86, 63, 39, 87, 69, 43]

cp's OEIS Frontend

A280875 Set a(1)=0, a(2)=1, a(3)=3; b(1)=1, b(2)=2; c(1)=3. Thereafter, a(n) is the smallest positive integer m such that m is not yet in sequence a, m-a(n-1) is not yet in sequence b, and m-a(n-2) is not yet in sequence c; set b(n-1)=m-a(n-1), c(n-2)=m-a(n-2).

Table of values

List of values

n	a(n)
1	0
2	1
3	3
4	2
5	5
6	9
7	4
8	13
9	10
10	6
11	18
12	11
13	16
14	7
15	25
16	17
17	15
18	28
19	12
20	19
21	27
22	8
23	14
24	24
25	35
26	49
27	20
28	37
29	52
30	21
31	44
32	33
33	23
34	47
35	41
36	29
37	54
38	70
39	22
40	42
41	61
42	36
43	78
44	31
45	53
46	74
47	30
48	57
49	83
50	26
51	56
52	84
53	32
54	64
55	51
56	34
57	71
58	100
59	38
60	81
61	60
62	40
63	86
64	63
65	39
66	87
67	69
68	43

n	a(n)
1	0
2	1
3	3
4	2
5	5
6	9
7	4
8	13
9	10
10	6
11	18
12	11
13	16
14	7
15	25
16	17
17	15
18	28
19	12
20	19
21	27
22	8
23	14
24	24
25	35
26	49
27	20
28	37
29	52
30	21
31	44
32	33
33	23
34	47
35	41
36	29
37	54
38	70
39	22
40	42
41	61
42	36
43	78
44	31
45	53
46	74
47	30
48	57
49	83
50	26
51	56
52	84
53	32
54	64
55	51
56	34
57	71
58	100
59	38
60	81
61	60
62	40
63	86
64	63
65	39
66	87
67	69
68	43

n	a(n)
1	0
2	1
3	3
4	2
5	5
6	9
7	4
8	13
9	10
10	6
11	18
12	11
13	16
14	7
15	25
16	17
17	15
18	28
19	12
20	19
21	27
22	8
23	14
24	24
25	35
26	49
27	20
28	37
29	52
30	21
31	44
32	33
33	23
34	47
35	41
36	29
37	54
38	70
39	22
40	42
41	61
42	36
43	78
44	31
45	53
46	74
47	30
48	57
49	83
50	26
51	56
52	84
53	32
54	64
55	51
56	34
57	71
58	100
59	38
60	81
61	60
62	40
63	86
64	63
65	39
66	87
67	69
68	43