A176223 - cp's OEIS frontend

A176223 Natural numbers k which give a prime by the function f(k) = 2 * k + 13 for at least two iterations.

n	a(n)
1	2
2	5
3	8
4	17
5	23
6	35
7	38
8	47
9	50
10	68
11	77
12	80
13	107
14	110
15	113
16	140
17	152
18	170
19	218
20	227
21	233
22	245
23	248
24	278
25	287
26	317
27	320
28	332
29	353
30	365
31	380
32	392
33	407
34	437
35	458
36	467
37	485
38	500
39	518
40	542
41	575
42	590
43	602
44	605
45	623
46	635
47	638
48	710
49	740
50	743
51	770
52	803
53	827
54	842

[2, 5, 8, 17, 23, 35, 38, 47, 50, 68, 77, 80, 107, 110, 113, 140, 152, 170, 218, 227, 233, 245, 248, 278, 287, 317, 320, 332, 353, 365, 380, 392, 407, 437, 458, 467, 485, 500, 518, 542, 575, 590, 602, 605, 623, 635, 638, 710, 740, 743, 770, 803, 827, 842]

cp's OEIS Frontend

A176223 Natural numbers k which give a prime by the function f(k) = 2 * k + 13 for at least two iterations.

Table of values

List of values

n	a(n)
1	2
2	5
3	8
4	17
5	23
6	35
7	38
8	47
9	50
10	68
11	77
12	80
13	107
14	110
15	113
16	140
17	152
18	170
19	218
20	227
21	233
22	245
23	248
24	278
25	287
26	317
27	320
28	332
29	353
30	365
31	380
32	392
33	407
34	437
35	458
36	467
37	485
38	500
39	518
40	542
41	575
42	590
43	602
44	605
45	623
46	635
47	638
48	710
49	740
50	743
51	770
52	803
53	827
54	842

n	a(n)
1	2
2	5
3	8
4	17
5	23
6	35
7	38
8	47
9	50
10	68
11	77
12	80
13	107
14	110
15	113
16	140
17	152
18	170
19	218
20	227
21	233
22	245
23	248
24	278
25	287
26	317
27	320
28	332
29	353
30	365
31	380
32	392
33	407
34	437
35	458
36	467
37	485
38	500
39	518
40	542
41	575
42	590
43	602
44	605
45	623
46	635
47	638
48	710
49	740
50	743
51	770
52	803
53	827
54	842

n	a(n)
1	2
2	5
3	8
4	17
5	23
6	35
7	38
8	47
9	50
10	68
11	77
12	80
13	107
14	110
15	113
16	140
17	152
18	170
19	218
20	227
21	233
22	245
23	248
24	278
25	287
26	317
27	320
28	332
29	353
30	365
31	380
32	392
33	407
34	437
35	458
36	467
37	485
38	500
39	518
40	542
41	575
42	590
43	602
44	605
45	623
46	635
47	638
48	710
49	740
50	743
51	770
52	803
53	827
54	842