A265672 - cp's OEIS frontend

A265672 a(n) = n + floor((n+1)/7)*(-1)^((n+1) mod 7).

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	7
7	6
8	9
9	8
10	11
11	10
12	13
13	15
14	12
15	17
16	14
17	19
18	16
19	21
20	23
21	18
22	25
23	20
24	27
25	22
26	29
27	31
28	24
29	33
30	26
31	35
32	28
33	37
34	39
35	30
36	41
37	32
38	43
39	34
40	45
41	47
42	36
43	49
44	38
45	51
46	40
47	53
48	55
49	42
50	57
51	44
52	59
53	46
54	61
55	63
56	48
57	65
58	50
59	67
60	52
61	69
62	71
63	54
64	73
65	56
66	75

[0, 1, 2, 3, 4, 5, 7, 6, 9, 8, 11, 10, 13, 15, 12, 17, 14, 19, 16, 21, 23, 18, 25, 20, 27, 22, 29, 31, 24, 33, 26, 35, 28, 37, 39, 30, 41, 32, 43, 34, 45, 47, 36, 49, 38, 51, 40, 53, 55, 42, 57, 44, 59, 46, 61, 63, 48, 65, 50, 67, 52, 69, 71, 54, 73, 56, 75]

cp's OEIS Frontend

A265672 a(n) = n + floor((n+1)/7)*(-1)^((n+1) mod 7).

Table of values

List of values

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	7
7	6
8	9
9	8
10	11
11	10
12	13
13	15
14	12
15	17
16	14
17	19
18	16
19	21
20	23
21	18
22	25
23	20
24	27
25	22
26	29
27	31
28	24
29	33
30	26
31	35
32	28
33	37
34	39
35	30
36	41
37	32
38	43
39	34
40	45
41	47
42	36
43	49
44	38
45	51
46	40
47	53
48	55
49	42
50	57
51	44
52	59
53	46
54	61
55	63
56	48
57	65
58	50
59	67
60	52
61	69
62	71
63	54
64	73
65	56
66	75

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	7
7	6
8	9
9	8
10	11
11	10
12	13
13	15
14	12
15	17
16	14
17	19
18	16
19	21
20	23
21	18
22	25
23	20
24	27
25	22
26	29
27	31
28	24
29	33
30	26
31	35
32	28
33	37
34	39
35	30
36	41
37	32
38	43
39	34
40	45
41	47
42	36
43	49
44	38
45	51
46	40
47	53
48	55
49	42
50	57
51	44
52	59
53	46
54	61
55	63
56	48
57	65
58	50
59	67
60	52
61	69
62	71
63	54
64	73
65	56
66	75

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	5
6	7
7	6
8	9
9	8
10	11
11	10
12	13
13	15
14	12
15	17
16	14
17	19
18	16
19	21
20	23
21	18
22	25
23	20
24	27
25	22
26	29
27	31
28	24
29	33
30	26
31	35
32	28
33	37
34	39
35	30
36	41
37	32
38	43
39	34
40	45
41	47
42	36
43	49
44	38
45	51
46	40
47	53
48	55
49	42
50	57
51	44
52	59
53	46
54	61
55	63
56	48
57	65
58	50
59	67
60	52
61	69
62	71
63	54
64	73
65	56
66	75