A135681 - cp's OEIS frontend

A135681 a(n)=n if n=1 or if n=prime. Otherwise, n=4 if n is even and n=1 if n is odd.

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

[1, 2, 3, 4, 5, 4, 7, 4, 1, 4, 11, 4, 13, 4, 1, 4, 17, 4, 19, 4, 1, 4, 23, 4, 1, 4, 1, 4, 29, 4, 31, 4, 1, 4, 1, 4, 37, 4, 1, 4, 41, 4, 43, 4, 1, 4, 47, 4, 1, 4, 1, 4, 53, 4, 1, 4, 1, 4, 59, 4, 61, 4, 1, 4, 1, 4, 67, 4, 1, 4, 71, 4, 73]

cp's OEIS Frontend

A135681 a(n)=n if n=1 or if n=prime. Otherwise, n=4 if n is even and n=1 if n is odd.

Table of values

List of values

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

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

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