A068682 - OEIS

A068682 as a simple table

n	a(n)
1	3
2	7
3	17
4	31
5	49
6	57
7	111
8	169
9	269
10	363
11	389
12	393
13	637
14	643
15	671
16	697
17	787
18	851
19	853
20	927
21	1033
22	1087
23	1089
24	1151
25	1153
26	1173
27	1217
28	1219
29	1233
30	1261
31	1331
32	1479
33	1671
34	1761
35	1767
36	1837
37	1841
38	1859
39	1921
40	2011
41	2147
42	2149
43	2283
44	2311
45	2353
46	2377
47	2409

[3,7,17,31,49,57,111,169,269,363,389,393,637,643, 671,697,787,851,853,927,1033,1087,1089,1151,1153, 1173,1217,1219,1233,1261,1331,1479,1671,1761,1767, 1837,1841,1859,1921,2011,2147,2149,2283,2311,2353, 2377,2409]