A375752 - cp's OEIS frontend

A375752 a(n) is the difference between T=n*(n+1)/2 and the largest prime not exceeding T.

n	a(n)
2	0
3	1
4	3
5	2
6	2
7	5
8	5
9	2
10	2
11	5
12	5
13	2
14	2
15	7
16	5
17	2
18	4
19	9
20	11
21	2
22	2
23	5
24	7
25	8
26	2
27	5
28	5
29	2
30	2
31	5
32	5
33	4
34	2
35	11
36	5
37	2
38	2
39	7
40	9
41	2
42	16
43	5
44	7
45	2
46	12
47	5
48	5
49	2
50	16
51	5
52	5
53	2
54	2
55	9
56	13
57	16
58	2
59	11
60	7
61	2
62	2
63	5
64	11
65	2
66	4
67	5
68	5
69	4
70	8
71	5
72	7
73	2
74	8
75	7
76	9
77	2
78	2
79	23
80	11
81	2
82	12
83	17
84	11
85	12
86	2

[0, 1, 3, 2, 2, 5, 5, 2, 2, 5, 5, 2, 2, 7, 5, 2, 4, 9, 11, 2, 2, 5, 7, 8, 2, 5, 5, 2, 2, 5, 5, 4, 2, 11, 5, 2, 2, 7, 9, 2, 16, 5, 7, 2, 12, 5, 5, 2, 16, 5, 5, 2, 2, 9, 13, 16, 2, 11, 7, 2, 2, 5, 11, 2, 4, 5, 5, 4, 8, 5, 7, 2, 8, 7, 9, 2, 2, 23, 11, 2, 12, 17, 11, 12, 2]

cp's OEIS Frontend

A375752 a(n) is the difference between T=n*(n+1)/2 and the largest prime not exceeding T.

Table of values

List of values

n	a(n)
2	0
3	1
4	3
5	2
6	2
7	5
8	5
9	2
10	2
11	5
12	5
13	2
14	2
15	7
16	5
17	2
18	4
19	9
20	11
21	2
22	2
23	5
24	7
25	8
26	2
27	5
28	5
29	2
30	2
31	5
32	5
33	4
34	2
35	11
36	5
37	2
38	2
39	7
40	9
41	2
42	16
43	5
44	7
45	2
46	12
47	5
48	5
49	2
50	16
51	5
52	5
53	2
54	2
55	9
56	13
57	16
58	2
59	11
60	7
61	2
62	2
63	5
64	11
65	2
66	4
67	5
68	5
69	4
70	8
71	5
72	7
73	2
74	8
75	7
76	9
77	2
78	2
79	23
80	11
81	2
82	12
83	17
84	11
85	12
86	2

n	a(n)
2	0
3	1
4	3
5	2
6	2
7	5
8	5
9	2
10	2
11	5
12	5
13	2
14	2
15	7
16	5
17	2
18	4
19	9
20	11
21	2
22	2
23	5
24	7
25	8
26	2
27	5
28	5
29	2
30	2
31	5
32	5
33	4
34	2
35	11
36	5
37	2
38	2
39	7
40	9
41	2
42	16
43	5
44	7
45	2
46	12
47	5
48	5
49	2
50	16
51	5
52	5
53	2
54	2
55	9
56	13
57	16
58	2
59	11
60	7
61	2
62	2
63	5
64	11
65	2
66	4
67	5
68	5
69	4
70	8
71	5
72	7
73	2
74	8
75	7
76	9
77	2
78	2
79	23
80	11
81	2
82	12
83	17
84	11
85	12
86	2

n	a(n)
2	0
3	1
4	3
5	2
6	2
7	5
8	5
9	2
10	2
11	5
12	5
13	2
14	2
15	7
16	5
17	2
18	4
19	9
20	11
21	2
22	2
23	5
24	7
25	8
26	2
27	5
28	5
29	2
30	2
31	5
32	5
33	4
34	2
35	11
36	5
37	2
38	2
39	7
40	9
41	2
42	16
43	5
44	7
45	2
46	12
47	5
48	5
49	2
50	16
51	5
52	5
53	2
54	2
55	9
56	13
57	16
58	2
59	11
60	7
61	2
62	2
63	5
64	11
65	2
66	4
67	5
68	5
69	4
70	8
71	5
72	7
73	2
74	8
75	7
76	9
77	2
78	2
79	23
80	11
81	2
82	12
83	17
84	11
85	12
86	2