A272476 - cp's OEIS frontend

A272476 a(n) = n if n is prime, a(n) = 2*n+3 otherwise.

n	a(n)
0	3
1	5
2	2
3	3
4	11
5	5
6	15
7	7
8	19
9	21
10	23
11	11
12	27
13	13
14	31
15	33
16	35
17	17
18	39
19	19
20	43
21	45
22	47
23	23
24	51
25	53
26	55
27	57
28	59
29	29
30	63
31	31
32	67
33	69
34	71
35	73
36	75
37	37
38	79
39	81
40	83
41	41
42	87
43	43
44	91
45	93
46	95
47	47
48	99
49	101
50	103
51	105
52	107
53	53
54	111
55	113
56	115
57	117
58	119
59	59
60	123
61	61
62	127

[3, 5, 2, 3, 11, 5, 15, 7, 19, 21, 23, 11, 27, 13, 31, 33, 35, 17, 39, 19, 43, 45, 47, 23, 51, 53, 55, 57, 59, 29, 63, 31, 67, 69, 71, 73, 75, 37, 79, 81, 83, 41, 87, 43, 91, 93, 95, 47, 99, 101, 103, 105, 107, 53, 111, 113, 115, 117, 119, 59, 123, 61, 127]

cp's OEIS Frontend

A272476 a(n) = n if n is prime, a(n) = 2*n+3 otherwise.

Table of values

List of values

n	a(n)
0	3
1	5
2	2
3	3
4	11
5	5
6	15
7	7
8	19
9	21
10	23
11	11
12	27
13	13
14	31
15	33
16	35
17	17
18	39
19	19
20	43
21	45
22	47
23	23
24	51
25	53
26	55
27	57
28	59
29	29
30	63
31	31
32	67
33	69
34	71
35	73
36	75
37	37
38	79
39	81
40	83
41	41
42	87
43	43
44	91
45	93
46	95
47	47
48	99
49	101
50	103
51	105
52	107
53	53
54	111
55	113
56	115
57	117
58	119
59	59
60	123
61	61
62	127

n	a(n)
0	3
1	5
2	2
3	3
4	11
5	5
6	15
7	7
8	19
9	21
10	23
11	11
12	27
13	13
14	31
15	33
16	35
17	17
18	39
19	19
20	43
21	45
22	47
23	23
24	51
25	53
26	55
27	57
28	59
29	29
30	63
31	31
32	67
33	69
34	71
35	73
36	75
37	37
38	79
39	81
40	83
41	41
42	87
43	43
44	91
45	93
46	95
47	47
48	99
49	101
50	103
51	105
52	107
53	53
54	111
55	113
56	115
57	117
58	119
59	59
60	123
61	61
62	127

n	a(n)
0	3
1	5
2	2
3	3
4	11
5	5
6	15
7	7
8	19
9	21
10	23
11	11
12	27
13	13
14	31
15	33
16	35
17	17
18	39
19	19
20	43
21	45
22	47
23	23
24	51
25	53
26	55
27	57
28	59
29	29
30	63
31	31
32	67
33	69
34	71
35	73
36	75
37	37
38	79
39	81
40	83
41	41
42	87
43	43
44	91
45	93
46	95
47	47
48	99
49	101
50	103
51	105
52	107
53	53
54	111
55	113
56	115
57	117
58	119
59	59
60	123
61	61
62	127