A071574 - cp's OEIS frontend

A071574 If n = k-th prime, a(n) = 2a(k) + 1; if n = k-th nonprime, a(n) = 2a(k).

n	a(n)
1	0
2	1
3	3
4	2
5	7
6	6
7	5
8	4
9	14
10	12
11	15
12	10
13	13
14	8
15	28
16	24
17	11
18	30
19	9
20	20
21	26
22	16
23	29
24	56
25	48
26	22
27	60
28	18
29	25
30	40
31	31
32	52
33	32
34	58
35	112
36	96
37	21
38	44
39	120
40	36
41	27
42	50
43	17
44	80
45	62
46	104
47	57
48	64
49	116
50	224
51	192
52	42
53	49
54	88
55	240
56	72
57	54
58	100
59	23
60	34
61	61
62	160
63	124
64	208
65	114
66	128
67	19

[0, 1, 3, 2, 7, 6, 5, 4, 14, 12, 15, 10, 13, 8, 28, 24, 11, 30, 9, 20, 26, 16, 29, 56, 48, 22, 60, 18, 25, 40, 31, 52, 32, 58, 112, 96, 21, 44, 120, 36, 27, 50, 17, 80, 62, 104, 57, 64, 116, 224, 192, 42, 49, 88, 240, 72, 54, 100, 23, 34, 61, 160, 124, 208, 114, 128, 19]

cp's OEIS Frontend

A071574 If n = k-th prime, a(n) = 2a(k) + 1; if n = k-th nonprime, a(n) = 2a(k).

Table of values

List of values

n	a(n)
1	0
2	1
3	3
4	2
5	7
6	6
7	5
8	4
9	14
10	12
11	15
12	10
13	13
14	8
15	28
16	24
17	11
18	30
19	9
20	20
21	26
22	16
23	29
24	56
25	48
26	22
27	60
28	18
29	25
30	40
31	31
32	52
33	32
34	58
35	112
36	96
37	21
38	44
39	120
40	36
41	27
42	50
43	17
44	80
45	62
46	104
47	57
48	64
49	116
50	224
51	192
52	42
53	49
54	88
55	240
56	72
57	54
58	100
59	23
60	34
61	61
62	160
63	124
64	208
65	114
66	128
67	19

n	a(n)
1	0
2	1
3	3
4	2
5	7
6	6
7	5
8	4
9	14
10	12
11	15
12	10
13	13
14	8
15	28
16	24
17	11
18	30
19	9
20	20
21	26
22	16
23	29
24	56
25	48
26	22
27	60
28	18
29	25
30	40
31	31
32	52
33	32
34	58
35	112
36	96
37	21
38	44
39	120
40	36
41	27
42	50
43	17
44	80
45	62
46	104
47	57
48	64
49	116
50	224
51	192
52	42
53	49
54	88
55	240
56	72
57	54
58	100
59	23
60	34
61	61
62	160
63	124
64	208
65	114
66	128
67	19

cp's OEIS Frontend

A071574 If n = k-th prime, a(n) = 2*a(k) + 1; if n = k-th nonprime, a(n) = 2*a(k).

Table of values

List of values

A071574 If n = k-th prime, a(n) = 2a(k) + 1; if n = k-th nonprime, a(n) = 2a(k).

n	a(n)
1	0
2	1
3	3
4	2
5	7
6	6
7	5
8	4
9	14
10	12
11	15
12	10
13	13
14	8
15	28
16	24
17	11
18	30
19	9
20	20
21	26
22	16
23	29
24	56
25	48
26	22
27	60
28	18
29	25
30	40
31	31
32	52
33	32
34	58
35	112
36	96
37	21
38	44
39	120
40	36
41	27
42	50
43	17
44	80
45	62
46	104
47	57
48	64
49	116
50	224
51	192
52	42
53	49
54	88
55	240
56	72
57	54
58	100
59	23
60	34
61	61
62	160
63	124
64	208
65	114
66	128
67	19