A387095 - cp's OEIS frontend

A387095 a(1) = 1 for the single prime 3; for n>=2, a(n) is the number of primes between 2^n and 2^(n+1) whose pairs lay symmetrically at each side of the center 3*2^(n-1) of that interval.

n	a(n)
1	1
2	2
3	2
4	4
5	4
6	6
7	8
8	22
9	26
10	42
11	92
12	128
13	218
14	416
15	750
16	1300
17	2342
18	4136
19	7440
20	13572
21	24820
22	45420
23	82922
24	152964
25	282626
26	522354
27	972388
28	1809744
29	3379508
30	6318652
31	11855790
32	22277960
33	41917480

[1, 2, 2, 4, 4, 6, 8, 22, 26, 42, 92, 128, 218, 416, 750, 1300, 2342, 4136, 7440, 13572, 24820, 45420, 82922, 152964, 282626, 522354, 972388, 1809744, 3379508, 6318652, 11855790, 22277960, 41917480]

cp's OEIS Frontend

A387095 a(1) = 1 for the single prime 3; for n>=2, a(n) is the number of primes between 2^n and 2^(n+1) whose pairs lay symmetrically at each side of the center 3*2^(n-1) of that interval.

Table of values

List of values