A068640 - cp's OEIS frontend

A068640 Define f(n) = 2n+1, a(n) = largest prime of the form f(f(f(...(n))). If no such prime exists then a(n) = 0.

n	a(n)
1	7
2	47
3	7
4	0
5	47
6	13
7	0
8	17
9	19
10	0
11	47
12	0
13	0
14	59
15	31
16	0
17	0
18	37
19	0
20	167
21	43
22	0
23	47
24	0
25	0
26	107
27	0
28	0
29	59
30	61
31	0
32	0
33	67
34	0
35	71
36	73
37	0
38	0
39	79
40	0
41	167
42	0
43	0
44	2879
45	0
46	0
47	0
48	97
49	0
50	101
51	103
52	0
53	107
54	109
55	0
56	227
57	0
58	0
59	0
60	0
61	0
62	0
63	127
64	0
65	263
66	0
67	0
68	137
69	139
70	0
71	0
72	0
73	0
74	149
75	151
76	0
77	0
78	157
79	0

[7, 47, 7, 0, 47, 13, 0, 17, 19, 0, 47, 0, 0, 59, 31, 0, 0, 37, 0, 167, 43, 0, 47, 0, 0, 107, 0, 0, 59, 61, 0, 0, 67, 0, 71, 73, 0, 0, 79, 0, 167, 0, 0, 2879, 0, 0, 0, 97, 0, 101, 103, 0, 107, 109, 0, 227, 0, 0, 0, 0, 0, 0, 127, 0, 263, 0, 0, 137, 139, 0, 0, 0, 0, 149, 151, 0, 0, 157, 0]

cp's OEIS Frontend

A068640 Define f(n) = 2n+1, a(n) = largest prime of the form f(f(f(...(n))). If no such prime exists then a(n) = 0.

Table of values

List of values