A292238 - cp's OEIS frontend

A292238 a(n) = gpf(lpf(2^prime(n) - 1) - 1) where prime(n) is the n-th prime.

n	a(n)
1	2
2	3
3	5
4	7
5	11
6	13
7	257
8	73
9	23
10	29
11	331
12	37
13	163
14	43
15	47
16	53
17	61
18	1321
19	2677
20	1609
21	73
22	79
23	83
24	2931542417
25	97
26	278557
27	599
28	28059810762433
29	31981
30	113
31	77158673929
32	131
33	27977333
34	457
35	37888318897441
36	151
37	4523
38	461
39	541
40	173
41	179
42	181
43	191
44	587
45	197
46	3690437

[2, 3, 5, 7, 11, 13, 257, 73, 23, 29, 331, 37, 163, 43, 47, 53, 61, 1321, 2677, 1609, 73, 79, 83, 2931542417, 97, 278557, 599, 28059810762433, 31981, 113, 77158673929, 131, 27977333, 457, 37888318897441, 151, 4523, 461, 541, 173, 179, 181, 191, 587, 197, 3690437]

cp's OEIS Frontend

A292238 a(n) = gpf(lpf(2^prime(n) - 1) - 1) where prime(n) is the n-th prime.

Table of values

List of values