A075402 - cp's OEIS frontend

A075402 Smallest number such that a(n) + T(n) is a prime, where T(n) is the n-th triangular number.

n	a(n)
1	1
2	0
3	1
4	1
5	2
6	2
7	1
8	1
9	2
10	4
11	1
12	1
13	6
14	2
15	7
16	1
17	4
18	2
19	1
20	1
21	2
22	4
23	1
24	7
25	6
26	2
27	1
28	3
29	4
30	2
31	3
32	13
33	2
34	4
35	1
36	7
37	6
38	2
39	7
40	1
41	2
42	4
43	1
44	1
45	4
46	6
47	1
48	5
49	4
50	2
51	1
52	3
53	2
54	2
55	3
56	1
57	4
58	10
59	7
60	1
61	10
62	20
63	1
64	1
65	8
66	2
67	3
68	1
69	2
70	18
71	1
72	5
73	6
74	2
75	1
76	1
77	8
78	2
79	3
80	11
81	2
82	4
83	5
84	1
85	4
86	20
87	5
88	1
89	2
90	4
91	15
92	5
93	2
94	16
95	1
96	1
97	6
98	10
99	1

[1, 0, 1, 1, 2, 2, 1, 1, 2, 4, 1, 1, 6, 2, 7, 1, 4, 2, 1, 1, 2, 4, 1, 7, 6, 2, 1, 3, 4, 2, 3, 13, 2, 4, 1, 7, 6, 2, 7, 1, 2, 4, 1, 1, 4, 6, 1, 5, 4, 2, 1, 3, 2, 2, 3, 1, 4, 10, 7, 1, 10, 20, 1, 1, 8, 2, 3, 1, 2, 18, 1, 5, 6, 2, 1, 1, 8, 2, 3, 11, 2, 4, 5, 1, 4, 20, 5, 1, 2, 4, 15, 5, 2, 16, 1, 1, 6, 10, 1]

cp's OEIS Frontend

A075402 Smallest number such that a(n) + T(n) is a prime, where T(n) is the n-th triangular number.

Table of values

List of values

n	a(n)
1	1
2	0
3	1
4	1
5	2
6	2
7	1
8	1
9	2
10	4
11	1
12	1
13	6
14	2
15	7
16	1
17	4
18	2
19	1
20	1
21	2
22	4
23	1
24	7
25	6
26	2
27	1
28	3
29	4
30	2
31	3
32	13
33	2
34	4
35	1
36	7
37	6
38	2
39	7
40	1
41	2
42	4
43	1
44	1
45	4
46	6
47	1
48	5
49	4
50	2
51	1
52	3
53	2
54	2
55	3
56	1
57	4
58	10
59	7
60	1
61	10
62	20
63	1
64	1
65	8
66	2
67	3
68	1
69	2
70	18
71	1
72	5
73	6
74	2
75	1
76	1
77	8
78	2
79	3
80	11
81	2
82	4
83	5
84	1
85	4
86	20
87	5
88	1
89	2
90	4
91	15
92	5
93	2
94	16
95	1
96	1
97	6
98	10
99	1

n	a(n)
1	1
2	0
3	1
4	1
5	2
6	2
7	1
8	1
9	2
10	4
11	1
12	1
13	6
14	2
15	7
16	1
17	4
18	2
19	1
20	1
21	2
22	4
23	1
24	7
25	6
26	2
27	1
28	3
29	4
30	2
31	3
32	13
33	2
34	4
35	1
36	7
37	6
38	2
39	7
40	1
41	2
42	4
43	1
44	1
45	4
46	6
47	1
48	5
49	4
50	2
51	1
52	3
53	2
54	2
55	3
56	1
57	4
58	10
59	7
60	1
61	10
62	20
63	1
64	1
65	8
66	2
67	3
68	1
69	2
70	18
71	1
72	5
73	6
74	2
75	1
76	1
77	8
78	2
79	3
80	11
81	2
82	4
83	5
84	1
85	4
86	20
87	5
88	1
89	2
90	4
91	15
92	5
93	2
94	16
95	1
96	1
97	6
98	10
99	1

n	a(n)
1	1
2	0
3	1
4	1
5	2
6	2
7	1
8	1
9	2
10	4
11	1
12	1
13	6
14	2
15	7
16	1
17	4
18	2
19	1
20	1
21	2
22	4
23	1
24	7
25	6
26	2
27	1
28	3
29	4
30	2
31	3
32	13
33	2
34	4
35	1
36	7
37	6
38	2
39	7
40	1
41	2
42	4
43	1
44	1
45	4
46	6
47	1
48	5
49	4
50	2
51	1
52	3
53	2
54	2
55	3
56	1
57	4
58	10
59	7
60	1
61	10
62	20
63	1
64	1
65	8
66	2
67	3
68	1
69	2
70	18
71	1
72	5
73	6
74	2
75	1
76	1
77	8
78	2
79	3
80	11
81	2
82	4
83	5
84	1
85	4
86	20
87	5
88	1
89	2
90	4
91	15
92	5
93	2
94	16
95	1
96	1
97	6
98	10
99	1