A139509 - OEIS

A139509 as a simple table

n	a(n)
1	31
2	97
3	211
4	373
5	547
6	607
7	661
8	769
9	877
10	1051
11	1087
12	1123
13	1249
14	1279
15	1303
16	1423
17	1597
18	1657
19	1663
20	1693
21	1741
22	1777
23	1861
24	1867
25	2143
26	2179
27	2251
28	2341
29	2467
30	2539
31	2791
32	2857
33	3229
34	3259
35	3319
36	3331
37	3373
38	3511
39	3541
40	3643
41	3697
42	3769
43	3823
44	3877

[31,97,211,373,547,607,661,769,877,1051,1087,1123, 1249,1279,1303,1423,1597,1657,1663,1693,1741,1777, 1861,1867,2143,2179,2251,2341,2467,2539,2791,2857, 3229,3259,3319,3331,3373,3511,3541,3643,3697,3769, 3823,3877]