A024698 - cp's OEIS frontend

A024698 a(n) = (prime(n+1) - 1)/4 if this is an integer or (prime(n+1) + 1)/4 otherwise.

n	a(n)
1	1
2	1
3	2
4	3
5	3
6	4
7	5
8	6
9	7
10	8
11	9
12	10
13	11
14	12
15	13
16	15
17	15
18	17
19	18
20	18
21	20
22	21
23	22
24	24
25	25
26	26
27	27
28	27
29	28
30	32
31	33
32	34
33	35
34	37
35	38
36	39
37	41
38	42
39	43
40	45
41	45
42	48
43	48
44	49
45	50
46	53
47	56
48	57
49	57
50	58
51	60
52	60
53	63
54	64
55	66
56	67
57	68
58	69
59	70
60	71
61	73
62	77
63	78
64	78
65	79
66	83
67	84
68	87
69	87
70	88
71	90
72	92
73	93
74	95
75	96
76	97
77	99
78	100

[1, 1, 2, 3, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 15, 17, 18, 18, 20, 21, 22, 24, 25, 26, 27, 27, 28, 32, 33, 34, 35, 37, 38, 39, 41, 42, 43, 45, 45, 48, 48, 49, 50, 53, 56, 57, 57, 58, 60, 60, 63, 64, 66, 67, 68, 69, 70, 71, 73, 77, 78, 78, 79, 83, 84, 87, 87, 88, 90, 92, 93, 95, 96, 97, 99, 100]

cp's OEIS Frontend

A024698 a(n) = (prime(n+1) - 1)/4 if this is an integer or (prime(n+1) + 1)/4 otherwise.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	3
5	3
6	4
7	5
8	6
9	7
10	8
11	9
12	10
13	11
14	12
15	13
16	15
17	15
18	17
19	18
20	18
21	20
22	21
23	22
24	24
25	25
26	26
27	27
28	27
29	28
30	32
31	33
32	34
33	35
34	37
35	38
36	39
37	41
38	42
39	43
40	45
41	45
42	48
43	48
44	49
45	50
46	53
47	56
48	57
49	57
50	58
51	60
52	60
53	63
54	64
55	66
56	67
57	68
58	69
59	70
60	71
61	73
62	77
63	78
64	78
65	79
66	83
67	84
68	87
69	87
70	88
71	90
72	92
73	93
74	95
75	96
76	97
77	99
78	100

n	a(n)
1	1
2	1
3	2
4	3
5	3
6	4
7	5
8	6
9	7
10	8
11	9
12	10
13	11
14	12
15	13
16	15
17	15
18	17
19	18
20	18
21	20
22	21
23	22
24	24
25	25
26	26
27	27
28	27
29	28
30	32
31	33
32	34
33	35
34	37
35	38
36	39
37	41
38	42
39	43
40	45
41	45
42	48
43	48
44	49
45	50
46	53
47	56
48	57
49	57
50	58
51	60
52	60
53	63
54	64
55	66
56	67
57	68
58	69
59	70
60	71
61	73
62	77
63	78
64	78
65	79
66	83
67	84
68	87
69	87
70	88
71	90
72	92
73	93
74	95
75	96
76	97
77	99
78	100

n	a(n)
1	1
2	1
3	2
4	3
5	3
6	4
7	5
8	6
9	7
10	8
11	9
12	10
13	11
14	12
15	13
16	15
17	15
18	17
19	18
20	18
21	20
22	21
23	22
24	24
25	25
26	26
27	27
28	27
29	28
30	32
31	33
32	34
33	35
34	37
35	38
36	39
37	41
38	42
39	43
40	45
41	45
42	48
43	48
44	49
45	50
46	53
47	56
48	57
49	57
50	58
51	60
52	60
53	63
54	64
55	66
56	67
57	68
58	69
59	70
60	71
61	73
62	77
63	78
64	78
65	79
66	83
67	84
68	87
69	87
70	88
71	90
72	92
73	93
74	95
75	96
76	97
77	99
78	100