A369854 - cp's OEIS frontend

A369854 a(n) = number of nonempty subsets S of {1,2,...,n} such that (number of nonprimes in S) = (number of primes in S).

n	a(n)
0	0
1	0
2	1
3	2
4	5
5	9
6	19
7	34
8	69
9	125
10	209
11	461
12	791
13	1715
14	3002
15	5004
16	8007
17	19447
18	31823
19	75581
20	125969
21	203489
22	319769
23	817189
24	1307503
25	2042974
26	3124549
27	4686824
28	6906899
29	20030009
30	30045014
31	84672314
32	129024479
33	193536719
34	286097759
35	417225899
36	600805295

[0, 0, 1, 2, 5, 9, 19, 34, 69, 125, 209, 461, 791, 1715, 3002, 5004, 8007, 19447, 31823, 75581, 125969, 203489, 319769, 817189, 1307503, 2042974, 3124549, 4686824, 6906899, 20030009, 30045014, 84672314, 129024479, 193536719, 286097759, 417225899, 600805295]

cp's OEIS Frontend

A369854 a(n) = number of nonempty subsets S of {1,2,...,n} such that (number of nonprimes in S) = (number of primes in S).

Table of values

List of values