A033220 - OEIS

A033220 as a simple table

n	a(n)
1	31
2	79
3	151
4	199
5	241
6	271
7	409
8	439
9	601
10	631
11	751
12	769
13	919
14	991
15	1009
16	1039
17	1129
18	1201
19	1231
20	1249
21	1279
22	1321
23	1399
24	1471
25	1489
26	1609
27	1759
28	1801
29	1831
30	1879
31	1951
32	1999
33	2089
34	2161
35	2239
36	2281

[31,79,151,199,241,271,409,439,601,631,751,769, 919,991,1009,1039,1129,1201,1231,1249,1279,1321, 1399,1471,1489,1609,1759,1801,1831,1879,1951,1999, 2089,2161,2239,2281]