A363702 - cp's OEIS frontend

A363702 Let m be the least integer for which there exists a strictly increasing sequence u of n integers in {1..m} such that x = (2 * Sum_{k=1..n} kprime(u(k))) / (n(n+1)) is an integer. a(n) is the least x, or -1 if no such integer x exists.

n	a(n)
1	2
2	4
3	11
4	12
5	12
6	12
7	16
8	21
9	24
10	22
11	24
12	31
13	32
14	34
15	41
16	40
17	42
18	44
19	49
20	50
21	52
22	52
23	61
24	63
25	62
26	68
27	70
28	75
29	74
30	82
31	88
32	89
33	92
34	92
35	102
36	106
37	106
38	106
39	113
40	118
41	118
42	118
43	125
44	127
45	132
46	132
47	141
48	148
49	142
50	150
51	154
52	158
53	158
54	162
55	171
56	175
57	172
58	178
59	181
60	187

[2, 4, 11, 12, 12, 12, 16, 21, 24, 22, 24, 31, 32, 34, 41, 40, 42, 44, 49, 50, 52, 52, 61, 63, 62, 68, 70, 75, 74, 82, 88, 89, 92, 92, 102, 106, 106, 106, 113, 118, 118, 118, 125, 127, 132, 132, 141, 148, 142, 150, 154, 158, 158, 162, 171, 175, 172, 178, 181, 187]

cp's OEIS Frontend

A363702 Let m be the least integer for which there exists a strictly increasing sequence u of n integers in {1..m} such that x = (2 * Sum_{k=1..n} kprime(u(k))) / (n(n+1)) is an integer. a(n) is the least x, or -1 if no such integer x exists.

Table of values

List of values

n	a(n)
1	2
2	4
3	11
4	12
5	12
6	12
7	16
8	21
9	24
10	22
11	24
12	31
13	32
14	34
15	41
16	40
17	42
18	44
19	49
20	50
21	52
22	52
23	61
24	63
25	62
26	68
27	70
28	75
29	74
30	82
31	88
32	89
33	92
34	92
35	102
36	106
37	106
38	106
39	113
40	118
41	118
42	118
43	125
44	127
45	132
46	132
47	141
48	148
49	142
50	150
51	154
52	158
53	158
54	162
55	171
56	175
57	172
58	178
59	181
60	187

n	a(n)
1	2
2	4
3	11
4	12
5	12
6	12
7	16
8	21
9	24
10	22
11	24
12	31
13	32
14	34
15	41
16	40
17	42
18	44
19	49
20	50
21	52
22	52
23	61
24	63
25	62
26	68
27	70
28	75
29	74
30	82
31	88
32	89
33	92
34	92
35	102
36	106
37	106
38	106
39	113
40	118
41	118
42	118
43	125
44	127
45	132
46	132
47	141
48	148
49	142
50	150
51	154
52	158
53	158
54	162
55	171
56	175
57	172
58	178
59	181
60	187

cp's OEIS Frontend

A363702 Let m be the least integer for which there exists a strictly increasing sequence u of n integers in {1..m} such that x = (2 * Sum_{k=1..n} k*prime(u(k))) / (n*(n+1)) is an integer. a(n) is the least x, or -1 if no such integer x exists.

Table of values

List of values

A363702 Let m be the least integer for which there exists a strictly increasing sequence u of n integers in {1..m} such that x = (2 * Sum_{k=1..n} kprime(u(k))) / (n(n+1)) is an integer. a(n) is the least x, or -1 if no such integer x exists.

n	a(n)
1	2
2	4
3	11
4	12
5	12
6	12
7	16
8	21
9	24
10	22
11	24
12	31
13	32
14	34
15	41
16	40
17	42
18	44
19	49
20	50
21	52
22	52
23	61
24	63
25	62
26	68
27	70
28	75
29	74
30	82
31	88
32	89
33	92
34	92
35	102
36	106
37	106
38	106
39	113
40	118
41	118
42	118
43	125
44	127
45	132
46	132
47	141
48	148
49	142
50	150
51	154
52	158
53	158
54	162
55	171
56	175
57	172
58	178
59	181
60	187