A007670 - OEIS

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A007670 as a simple table

n	a(n)
1	3
2	7
3	47
4	73
5	79
6	113
7	151
8	167
9	239
10	241
11	353
12	367
13	457
14	1367
15	3041
16	27529
17	49207
18	160423
19	364289
20	991961
21	1203793
22	1667321
23	4792057

[3,7,47,73,79,113,151,167,239,241,353,367,457, 1367,3041,27529,49207,160423,364289,991961, 1203793,1667321,4792057]