A374834 - cp's OEIS frontend

A374834 Start the sequence with a(1) = 3. From now on iterate: if |a(n)| is prime, subtract from a(n) the |a(n)|-th prime of the list of primes A000040 and if |a(n)| is nonprime, add to a(n) the |a(n)|-th nonprime of the list of nonprimes A018252.

n	a(n)
1	3
2	-2
3	-5
4	-16
5	9
6	24
7	59
8	-218
9	58
10	138
11	316
12	709
13	-4672
14	708
15	1563
16	3408
17	7364
18	15779
19	33601
20	-363046
21	33600
22	71181
23	150103
24	315315
25	660199
26	-9268542
27	660198
28	1378289
29	2870170
30	5963401
31	12365326
32	25593793
33	52887805
34	109127470
35	224867446
36	462788654
37	951362304
38	1953684017
39	-43964452250
40	1953684016

[3, -2, -5, -16, 9, 24, 59, -218, 58, 138, 316, 709, -4672, 708, 1563, 3408, 7364, 15779, 33601, -363046, 33600, 71181, 150103, 315315, 660199, -9268542, 660198, 1378289, 2870170, 5963401, 12365326, 25593793, 52887805, 109127470, 224867446, 462788654, 951362304, 1953684017, -43964452250, 1953684016]

cp's OEIS Frontend

A374834 Start the sequence with a(1) = 3. From now on iterate: if |a(n)| is prime, subtract from a(n) the |a(n)|-th prime of the list of primes A000040 and if |a(n)| is nonprime, add to a(n) the |a(n)|-th nonprime of the list of nonprimes A018252.

Table of values

List of values