A124190 - cp's OEIS frontend

A124190 a(n) is the largest prime < 4*a(n-1) for n > 1, with a(1) = 2.

n	a(n)
1	2
2	7
3	23
4	89
5	353
6	1409
7	5623
8	22483
9	89923
10	359663
11	1438643
12	5754571
13	23018273
14	92073083
15	368292317
16	1473169213
17	5892676849
18	23570707387
19	94282829533
20	377131318127
21	1508525272477
22	6034101089897
23	24136404359569
24	96545617438253
25	386182469752993
26	1544729879011951

[2, 7, 23, 89, 353, 1409, 5623, 22483, 89923, 359663, 1438643, 5754571, 23018273, 92073083, 368292317, 1473169213, 5892676849, 23570707387, 94282829533, 377131318127, 1508525272477, 6034101089897, 24136404359569, 96545617438253, 386182469752993, 1544729879011951]

cp's OEIS Frontend

A124190 a(n) is the largest prime < 4*a(n-1) for n > 1, with a(1) = 2.

Table of values

List of values