A318972 - cp's OEIS frontend

A318972 The 7x+-1 function ("shortcut" definition): a(n) = (7n+1)/4 if n == +1 (mod 4), a(n) = (7n-1)/4 if n == -1 (mod 4), otherwise a(n) = n/2.

n	a(n)
0	0
1	2
2	1
3	5
4	2
5	9
6	3
7	12
8	4
9	16
10	5
11	19
12	6
13	23
14	7
15	26
16	8
17	30
18	9
19	33
20	10
21	37
22	11
23	40
24	12
25	44
26	13
27	47
28	14
29	51
30	15
31	54
32	16
33	58
34	17
35	61
36	18
37	65
38	19
39	68
40	20
41	72
42	21
43	75
44	22
45	79
46	23
47	82
48	24
49	86
50	25
51	89
52	26
53	93
54	27
55	96
56	28
57	100
58	29
59	103
60	30
61	107
62	31
63	110
64	32
65	114
66	33
67	117
68	34
69	121

[0, 2, 1, 5, 2, 9, 3, 12, 4, 16, 5, 19, 6, 23, 7, 26, 8, 30, 9, 33, 10, 37, 11, 40, 12, 44, 13, 47, 14, 51, 15, 54, 16, 58, 17, 61, 18, 65, 19, 68, 20, 72, 21, 75, 22, 79, 23, 82, 24, 86, 25, 89, 26, 93, 27, 96, 28, 100, 29, 103, 30, 107, 31, 110, 32, 114, 33, 117, 34, 121]

cp's OEIS Frontend

A318972 The 7x+-1 function ("shortcut" definition): a(n) = (7n+1)/4 if n == +1 (mod 4), a(n) = (7n-1)/4 if n == -1 (mod 4), otherwise a(n) = n/2.

Table of values

List of values

n	a(n)
0	0
1	2
2	1
3	5
4	2
5	9
6	3
7	12
8	4
9	16
10	5
11	19
12	6
13	23
14	7
15	26
16	8
17	30
18	9
19	33
20	10
21	37
22	11
23	40
24	12
25	44
26	13
27	47
28	14
29	51
30	15
31	54
32	16
33	58
34	17
35	61
36	18
37	65
38	19
39	68
40	20
41	72
42	21
43	75
44	22
45	79
46	23
47	82
48	24
49	86
50	25
51	89
52	26
53	93
54	27
55	96
56	28
57	100
58	29
59	103
60	30
61	107
62	31
63	110
64	32
65	114
66	33
67	117
68	34
69	121

n	a(n)
0	0
1	2
2	1
3	5
4	2
5	9
6	3
7	12
8	4
9	16
10	5
11	19
12	6
13	23
14	7
15	26
16	8
17	30
18	9
19	33
20	10
21	37
22	11
23	40
24	12
25	44
26	13
27	47
28	14
29	51
30	15
31	54
32	16
33	58
34	17
35	61
36	18
37	65
38	19
39	68
40	20
41	72
42	21
43	75
44	22
45	79
46	23
47	82
48	24
49	86
50	25
51	89
52	26
53	93
54	27
55	96
56	28
57	100
58	29
59	103
60	30
61	107
62	31
63	110
64	32
65	114
66	33
67	117
68	34
69	121

n	a(n)
0	0
1	2
2	1
3	5
4	2
5	9
6	3
7	12
8	4
9	16
10	5
11	19
12	6
13	23
14	7
15	26
16	8
17	30
18	9
19	33
20	10
21	37
22	11
23	40
24	12
25	44
26	13
27	47
28	14
29	51
30	15
31	54
32	16
33	58
34	17
35	61
36	18
37	65
38	19
39	68
40	20
41	72
42	21
43	75
44	22
45	79
46	23
47	82
48	24
49	86
50	25
51	89
52	26
53	93
54	27
55	96
56	28
57	100
58	29
59	103
60	30
61	107
62	31
63	110
64	32
65	114
66	33
67	117
68	34
69	121