A328823 - cp's OEIS frontend

A328823 a(n) is the least prime factor of A000096(n) = n*(n+3)/2.

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

[2, 5, 3, 2, 2, 3, 5, 2, 2, 5, 7, 2, 2, 7, 3, 2, 2, 3, 11, 2, 2, 5, 13, 2, 2, 13, 3, 2, 2, 3, 17, 2, 2, 17, 5, 2, 2, 19, 3, 2, 2, 3, 23, 2, 2, 7, 5, 2, 2, 5, 3, 2, 2, 3, 5, 2, 2, 29, 31, 2, 2, 5, 3, 2, 2, 3, 5, 2, 2, 5, 37, 2, 2, 7, 3, 2, 2]

cp's OEIS Frontend

A328823 a(n) is the least prime factor of A000096(n) = n*(n+3)/2.

Table of values

List of values

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

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

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