A135376 - cp's OEIS frontend

A135376 a(n) is the smallest prime that does not divide n(n+1)/2.

n	a(n)
1	2
2	2
3	5
4	3
5	2
6	2
7	3
8	5
9	2
10	2
11	5
12	5
13	2
14	2
15	7
16	3
17	2
18	2
19	3
20	11
21	2
22	2
23	5
24	7
25	2
26	2
27	5
28	3
29	2
30	2
31	3
32	5
33	2
34	2
35	11
36	5
37	2
38	2
39	7
40	3
41	2
42	2
43	3
44	7
45	2
46	2
47	5
48	5
49	2
50	2
51	5
52	3
53	2
54	2
55	3
56	5
57	2
58	2
59	7
60	7
61	2
62	2
63	5
64	3
65	2
66	2
67	3
68	5
69	2
70	2
71	5
72	5
73	2
74	2
75	7
76	3
77	2
78	2
79	3
80	7
81	2
82	2
83	5
84	11
85	2
86	2
87	5
88	3
89	2
90	2
91	3
92	5
93	2
94	2
95	7
96	5
97	2
98	2
99	7
100	3
101	2
102	2
103	3

[2, 2, 5, 3, 2, 2, 3, 5, 2, 2, 5, 5, 2, 2, 7, 3, 2, 2, 3, 11, 2, 2, 5, 7, 2, 2, 5, 3, 2, 2, 3, 5, 2, 2, 11, 5, 2, 2, 7, 3, 2, 2, 3, 7, 2, 2, 5, 5, 2, 2, 5, 3, 2, 2, 3, 5, 2, 2, 7, 7, 2, 2, 5, 3, 2, 2, 3, 5, 2, 2, 5, 5, 2, 2, 7, 3, 2, 2, 3, 7, 2, 2, 5, 11, 2, 2, 5, 3, 2, 2, 3, 5, 2, 2, 7, 5, 2, 2, 7, 3, 2, 2, 3]

cp's OEIS Frontend

A135376 a(n) is the smallest prime that does not divide n(n+1)/2.

Table of values

List of values

n	a(n)
1	2
2	2
3	5
4	3
5	2
6	2
7	3
8	5
9	2
10	2
11	5
12	5
13	2
14	2
15	7
16	3
17	2
18	2
19	3
20	11
21	2
22	2
23	5
24	7
25	2
26	2
27	5
28	3
29	2
30	2
31	3
32	5
33	2
34	2
35	11
36	5
37	2
38	2
39	7
40	3
41	2
42	2
43	3
44	7
45	2
46	2
47	5
48	5
49	2
50	2
51	5
52	3
53	2
54	2
55	3
56	5
57	2
58	2
59	7
60	7
61	2
62	2
63	5
64	3
65	2
66	2
67	3
68	5
69	2
70	2
71	5
72	5
73	2
74	2
75	7
76	3
77	2
78	2
79	3
80	7
81	2
82	2
83	5
84	11
85	2
86	2
87	5
88	3
89	2
90	2
91	3
92	5
93	2
94	2
95	7
96	5
97	2
98	2
99	7
100	3
101	2
102	2
103	3

n	a(n)
1	2
2	2
3	5
4	3
5	2
6	2
7	3
8	5
9	2
10	2
11	5
12	5
13	2
14	2
15	7
16	3
17	2
18	2
19	3
20	11
21	2
22	2
23	5
24	7
25	2
26	2
27	5
28	3
29	2
30	2
31	3
32	5
33	2
34	2
35	11
36	5
37	2
38	2
39	7
40	3
41	2
42	2
43	3
44	7
45	2
46	2
47	5
48	5
49	2
50	2
51	5
52	3
53	2
54	2
55	3
56	5
57	2
58	2
59	7
60	7
61	2
62	2
63	5
64	3
65	2
66	2
67	3
68	5
69	2
70	2
71	5
72	5
73	2
74	2
75	7
76	3
77	2
78	2
79	3
80	7
81	2
82	2
83	5
84	11
85	2
86	2
87	5
88	3
89	2
90	2
91	3
92	5
93	2
94	2
95	7
96	5
97	2
98	2
99	7
100	3
101	2
102	2
103	3

n	a(n)
1	2
2	2
3	5
4	3
5	2
6	2
7	3
8	5
9	2
10	2
11	5
12	5
13	2
14	2
15	7
16	3
17	2
18	2
19	3
20	11
21	2
22	2
23	5
24	7
25	2
26	2
27	5
28	3
29	2
30	2
31	3
32	5
33	2
34	2
35	11
36	5
37	2
38	2
39	7
40	3
41	2
42	2
43	3
44	7
45	2
46	2
47	5
48	5
49	2
50	2
51	5
52	3
53	2
54	2
55	3
56	5
57	2
58	2
59	7
60	7
61	2
62	2
63	5
64	3
65	2
66	2
67	3
68	5
69	2
70	2
71	5
72	5
73	2
74	2
75	7
76	3
77	2
78	2
79	3
80	7
81	2
82	2
83	5
84	11
85	2
86	2
87	5
88	3
89	2
90	2
91	3
92	5
93	2
94	2
95	7
96	5
97	2
98	2
99	7
100	3
101	2
102	2
103	3