A131694 - cp's OEIS frontend

A131694 Numbers k such that abs(S(k)) = A008347(k) is prime, where S(k) = S(k-1) + A000040(k)*(-1)^k; S(0) = 0.

n	a(n)
1	1
2	4
3	6
4	8
5	10
6	12
7	18
8	28
9	32
10	38
11	42
12	46
13	50
14	52
15	54
16	64
17	68
18	70
19	72
20	74
21	76
22	86
23	88
24	98
25	100
26	110
27	126
28	128
29	130
30	140
31	146
32	152
33	162
34	192
35	202
36	214
37	226
38	242
39	252
40	258
41	264
42	270
43	290
44	294
45	304
46	308
47	314
48	316
49	320
50	322
51	332
52	342
53	348
54	352
55	358
56	360

[1, 4, 6, 8, 10, 12, 18, 28, 32, 38, 42, 46, 50, 52, 54, 64, 68, 70, 72, 74, 76, 86, 88, 98, 100, 110, 126, 128, 130, 140, 146, 152, 162, 192, 202, 214, 226, 242, 252, 258, 264, 270, 290, 294, 304, 308, 314, 316, 320, 322, 332, 342, 348, 352, 358, 360]

cp's OEIS Frontend

A131694 Numbers k such that abs(S(k)) = A008347(k) is prime, where S(k) = S(k-1) + A000040(k)*(-1)^k; S(0) = 0.

Table of values

List of values

n	a(n)
1	1
2	4
3	6
4	8
5	10
6	12
7	18
8	28
9	32
10	38
11	42
12	46
13	50
14	52
15	54
16	64
17	68
18	70
19	72
20	74
21	76
22	86
23	88
24	98
25	100
26	110
27	126
28	128
29	130
30	140
31	146
32	152
33	162
34	192
35	202
36	214
37	226
38	242
39	252
40	258
41	264
42	270
43	290
44	294
45	304
46	308
47	314
48	316
49	320
50	322
51	332
52	342
53	348
54	352
55	358
56	360

n	a(n)
1	1
2	4
3	6
4	8
5	10
6	12
7	18
8	28
9	32
10	38
11	42
12	46
13	50
14	52
15	54
16	64
17	68
18	70
19	72
20	74
21	76
22	86
23	88
24	98
25	100
26	110
27	126
28	128
29	130
30	140
31	146
32	152
33	162
34	192
35	202
36	214
37	226
38	242
39	252
40	258
41	264
42	270
43	290
44	294
45	304
46	308
47	314
48	316
49	320
50	322
51	332
52	342
53	348
54	352
55	358
56	360

n	a(n)
1	1
2	4
3	6
4	8
5	10
6	12
7	18
8	28
9	32
10	38
11	42
12	46
13	50
14	52
15	54
16	64
17	68
18	70
19	72
20	74
21	76
22	86
23	88
24	98
25	100
26	110
27	126
28	128
29	130
30	140
31	146
32	152
33	162
34	192
35	202
36	214
37	226
38	242
39	252
40	258
41	264
42	270
43	290
44	294
45	304
46	308
47	314
48	316
49	320
50	322
51	332
52	342
53	348
54	352
55	358
56	360