A233809 - cp's OEIS frontend

A233809 a(n) = Sum_{k=1..n} prime(k) * s(k), where s(k) = (-1)^(floor(k/2)).

n	a(n)
1	2
2	-1
3	-6
4	1
5	12
6	-1
7	-18
8	1
9	24
10	-5
11	-36
12	1
13	42
14	-1
15	-48
16	5
17	64
18	3
19	-64
20	7
21	80
22	1
23	-82
24	7
25	104
26	3
27	-100
28	7
29	116
30	3
31	-124
32	7
33	144
34	5
35	-144
36	7
37	164
38	1
39	-166
40	7
41	186
42	5
43	-186
44	7
45	204
46	5
47	-206
48	17
49	244
50	15
51	-218
52	21
53	262
54	11
55	-246
56	17
57	286
58	15
59	-262

[2, -1, -6, 1, 12, -1, -18, 1, 24, -5, -36, 1, 42, -1, -48, 5, 64, 3, -64, 7, 80, 1, -82, 7, 104, 3, -100, 7, 116, 3, -124, 7, 144, 5, -144, 7, 164, 1, -166, 7, 186, 5, -186, 7, 204, 5, -206, 17, 244, 15, -218, 21, 262, 11, -246, 17, 286, 15, -262]

cp's OEIS Frontend

A233809 a(n) = Sum_{k=1..n} prime(k) * s(k), where s(k) = (-1)^(floor(k/2)).

Table of values

List of values