A091431 - OEIS

A091431 as a simple table

n	a(n)
1	1
2	7
3	13
4	31
5	49
6	79
7	129
8	133
9	193
10	219
11	319
12	331
13	367
14	391
15	409
16	487
17	655
18	673
19	739
20	931
21	937
22	1009
23	1029
24	1039
25	1093
26	1209
27	1233
28	1251
29	1275
30	1281
31	1285
32	1303
33	1309
34	1323
35	1339
36	1533
37	1575
38	1587
39	1599
40	1663
41	1771
42	1857
43	1933
44	1959
45	1995
46	2019
47	2115

[1,7,13,31,49,79,129,133,193,219,319,331,367,391, 409,487,655,673,739,931,937,1009,1029,1039,1093, 1209,1233,1251,1275,1281,1285,1303,1309,1323,1339, 1533,1575,1587,1599,1663,1771,1857,1933,1959,1995, 2019,2115]