A100707 - cp's OEIS frontend

A100707 a(1) = 1; for n > 1, a(n+1)=a(n)-k if there exists a positive number k (take the smallest) that has not yet been used and is such that a(n+1) is new and >0, otherwise a(n+1) = a(n)+k if the same conditions are satisfied.

n	a(n)
1	1
2	2
3	4
4	7
5	3
6	8
7	14
8	6
9	13
10	22
11	12
12	23
13	11
14	24
15	10
16	25
17	9
18	26
19	5
20	27
21	45
22	21
23	40
24	20
25	43
26	18
27	44
28	17
29	46
30	16
31	47
32	19
33	51
34	15
35	48
36	82
37	42
38	77
39	39
40	76
41	37
42	78
43	36
44	79
45	35
46	80
47	34
48	81
49	33
50	83
51	32
52	84
53	31
54	85
55	30
56	86
57	29
58	87
59	38
60	97
61	28
62	88
63	149
64	75
65	137
66	74

[1, 2, 4, 7, 3, 8, 14, 6, 13, 22, 12, 23, 11, 24, 10, 25, 9, 26, 5, 27, 45, 21, 40, 20, 43, 18, 44, 17, 46, 16, 47, 19, 51, 15, 48, 82, 42, 77, 39, 76, 37, 78, 36, 79, 35, 80, 34, 81, 33, 83, 32, 84, 31, 85, 30, 86, 29, 87, 38, 97, 28, 88, 149, 75, 137, 74]

cp's OEIS Frontend

A100707 a(1) = 1; for n > 1, a(n+1)=a(n)-k if there exists a positive number k (take the smallest) that has not yet been used and is such that a(n+1) is new and >0, otherwise a(n+1) = a(n)+k if the same conditions are satisfied.

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	7
5	3
6	8
7	14
8	6
9	13
10	22
11	12
12	23
13	11
14	24
15	10
16	25
17	9
18	26
19	5
20	27
21	45
22	21
23	40
24	20
25	43
26	18
27	44
28	17
29	46
30	16
31	47
32	19
33	51
34	15
35	48
36	82
37	42
38	77
39	39
40	76
41	37
42	78
43	36
44	79
45	35
46	80
47	34
48	81
49	33
50	83
51	32
52	84
53	31
54	85
55	30
56	86
57	29
58	87
59	38
60	97
61	28
62	88
63	149
64	75
65	137
66	74

n	a(n)
1	1
2	2
3	4
4	7
5	3
6	8
7	14
8	6
9	13
10	22
11	12
12	23
13	11
14	24
15	10
16	25
17	9
18	26
19	5
20	27
21	45
22	21
23	40
24	20
25	43
26	18
27	44
28	17
29	46
30	16
31	47
32	19
33	51
34	15
35	48
36	82
37	42
38	77
39	39
40	76
41	37
42	78
43	36
44	79
45	35
46	80
47	34
48	81
49	33
50	83
51	32
52	84
53	31
54	85
55	30
56	86
57	29
58	87
59	38
60	97
61	28
62	88
63	149
64	75
65	137
66	74

n	a(n)
1	1
2	2
3	4
4	7
5	3
6	8
7	14
8	6
9	13
10	22
11	12
12	23
13	11
14	24
15	10
16	25
17	9
18	26
19	5
20	27
21	45
22	21
23	40
24	20
25	43
26	18
27	44
28	17
29	46
30	16
31	47
32	19
33	51
34	15
35	48
36	82
37	42
38	77
39	39
40	76
41	37
42	78
43	36
44	79
45	35
46	80
47	34
48	81
49	33
50	83
51	32
52	84
53	31
54	85
55	30
56	86
57	29
58	87
59	38
60	97
61	28
62	88
63	149
64	75
65	137
66	74