A154752 - cp's OEIS frontend

A154752 Least prime p (or 0) such that n = p + T, where T is a triangular number (A000217), or -1 if there is no such representation.

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

[0, 2, 0, 3, 2, 0, 7, 2, 3, 0, 5, 2, 3, 11, 0, 13, 2, 3, 13, 5, 0, 7, 2, 3, 19, 5, 17, 0, 19, 2, 3, 11, 5, 13, 7, 0, 31, 2, 3, 19, 5, 41, 7, 23, 0, 31, 2, 3, 13, 5, 23, 7, 17, 53, 0, 11, 2, 3, 23, 5, 61, 7, 53, 19, 29, 0, 31, 2, 3, 67, 5, 17, 7, 19, 47, 31, 11, 0, 13, 2, 3, 37, 5, 29, 7, 31, 59, 43]

cp's OEIS Frontend

A154752 Least prime p (or 0) such that n = p + T, where T is a triangular number (A000217), or -1 if there is no such representation.

Table of values

List of values

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

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

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