A140540 - OEIS

A140540 as a simple table

n	a(n)
1	31
2	167
3	269
4	337
5	439
6	541
7	643
8	677
9	881
10	983
11	1051
12	1153
13	1187
14	1289
15	1459
16	1493
17	1663
18	1697
19	1867
20	1901
21	2003
22	2207
23	2309
24	2377
25	2411
26	2683
27	2819
28	2887
29	3023
30	3329
31	3499
32	3533
33	3907
34	4111
35	4349
36	4451
37	4519
38	4621
39	4723
40	5233
41	5437
42	5471
43	5573
44	5641
45	5743

[31,167,269,337,439,541,643,677,881,983,1051,1153, 1187,1289,1459,1493,1663,1697,1867,1901,2003,2207, 2309,2377,2411,2683,2819,2887,3023,3329,3499,3533, 3907,4111,4349,4451,4519,4621,4723,5233,5437,5471, 5573,5641,5743]