A097224 - OEIS

A097224 as a simple table

n	a(n)
1	2
2	3
3	3
4	3
5	5
6	5
7	5
8	5
9	7
10	7
11	7
12	7
13	7
14	7
15	7
16	7
17	19
18	19
19	23
20	31
21	31
22	47
23	73
24	103
25	139
26	173
27	173
28	173
29	211
30	233
31	293
32	313
33	331
34	359
35	383
36	389
37	389
38	523
39	601
40	727
41	751
42	829
43	929
44	997
45	1039
46	1093
47	1163
48	1321
49	1427
50	1583

[2,3,3,3,5,5,5,5,7,7,7,7,7,7,7,7,19,19,23,31,31, 47,73,103,139,173,173,173,211,233,293,313,331,359, 383,389,389,523,601,727,751,829,929,997,1039,1093, 1163,1321,1427,1583]