A079651 - OEIS

A079651 as a simple table

n	a(n)
1	7
2	11
3	17
4	41
5	47
6	71
7	1117
8	1171
9	1447
10	1471
11	1741
12	1747
13	1777
14	4111
15	4177
16	4441
17	4447
18	7177
19	7411
20	7417
21	7477
22	7717
23	7741
24	11117
25	11171
26	11177
27	11411
28	11447
29	11471
30	11717
31	11777
32	14177
33	14411
34	14447
35	14717
36	14741
37	14747
38	14771
39	17117
40	17417

[7,11,17,41,47,71,1117,1171,1447,1471,1741,1747, 1777,4111,4177,4441,4447,7177,7411,7417,7477,7717, 7741,11117,11171,11177,11411,11447,11471,11717, 11777,14177,14411,14447,14717,14741,14747,14771, 17117,17417]

[7,11,17,41,47,71,1117,1171,1447,1471,1741,1747,
 1777,4111,4177,4441,4447,7177,7411,7417,7477,7717,
 7741,11117,11171,11177,11411,11447,11471,11717,
 11777,14177,14411,14447,14717,14741,14747,14771,
 17117,17417]