A365815 - cp's OEIS frontend

A365815 a(n) is the least centered n-gonal prime, or -1 if none exists.

n	a(n)
3	19
4	5
5	31
6	7
7	43
8	-1
9	-1
10	11
11	67
12	13
13	79
14	43
15	151
16	17
17	103
18	19
19	191
20	61
21	127
22	23
23	139
24	73
25	151
26	79
27	163
28	29
29	6091
30	31
31	311
32	97
33	199
34	103
35	211
36	37
37	223
38	229
39	1093
40	41
41	2707
42	43
43	431
44	661
45	271
46	47
47	283
48	1009
49	491
50	151
51	307
52	53
53	3499
54	163
55	331
56	337
57	571
58	59
59	4603
60	61

[19, 5, 31, 7, 43, -1, -1, 11, 67, 13, 79, 43, 151, 17, 103, 19, 191, 61, 127, 23, 139, 73, 151, 79, 163, 29, 6091, 31, 311, 97, 199, 103, 211, 37, 223, 229, 1093, 41, 2707, 43, 431, 661, 271, 47, 283, 1009, 491, 151, 307, 53, 3499, 163, 331, 337, 571, 59, 4603, 61]

cp's OEIS Frontend

A365815 a(n) is the least centered n-gonal prime, or -1 if none exists.

Table of values

List of values