A073798 - cp's OEIS frontend

A073798 pi(n) is a power of 2, where pi(n) = A000720(n) is the number of primes <= n.

n	a(n)
1	2
2	3
3	4
4	7
5	8
6	9
7	10
8	19
9	20
10	21
11	22
12	53
13	54
14	55
15	56
16	57
17	58
18	131
19	132
20	133
21	134
22	135
23	136
24	311
25	312
26	719
27	720
28	721
29	722
30	723
31	724
32	725
33	726
34	1619
35	1620
36	3671
37	3672
38	8161
39	8162
40	8163
41	8164
42	8165
43	8166
44	17863
45	17864
46	17865
47	17866
48	17867
49	17868
50	17869
51	17870

[2, 3, 4, 7, 8, 9, 10, 19, 20, 21, 22, 53, 54, 55, 56, 57, 58, 131, 132, 133, 134, 135, 136, 311, 312, 719, 720, 721, 722, 723, 724, 725, 726, 1619, 1620, 3671, 3672, 8161, 8162, 8163, 8164, 8165, 8166, 17863, 17864, 17865, 17866, 17867, 17868, 17869, 17870]

cp's OEIS Frontend

A073798 pi(n) is a power of 2, where pi(n) = A000720(n) is the number of primes <= n.

Table of values

List of values