A354846 - cp's OEIS frontend

A354846 a(n) is the first composite k such that exactly n primes are the sum of all but one of the numbers from 1 to k-1 that are coprime to k, or -1 if there is no such k.

n	a(n)
1	4
2	8
3	15
4	10
5	18
6	22
7	34
8	42
9	39
10	64
11	60
12	66
13	74
14	82
15	75
16	115
17	102
18	136
19	106
20	156
21	162
22	160
23	203
24	190
25	186
26	210
27	213
28	268
29	226
30	246
31	240
32	291
33	304
34	300
35	306
36	312
37	364
38	330
39	344
40	342
41	362
42	368
43	386
44	412
45	448
46	420
47	466
48	450
49	472
50	474
51	496
52	518
53	495
54	539
55	483
56	510
57	594
58	660
59	564
60	609
61	655
62	708
63	636

[4, 8, 15, 10, 18, 22, 34, 42, 39, 64, 60, 66, 74, 82, 75, 115, 102, 136, 106, 156, 162, 160, 203, 190, 186, 210, 213, 268, 226, 246, 240, 291, 304, 300, 306, 312, 364, 330, 344, 342, 362, 368, 386, 412, 448, 420, 466, 450, 472, 474, 496, 518, 495, 539, 483, 510, 594, 660, 564, 609, 655, 708, 636]

cp's OEIS Frontend

A354846 a(n) is the first composite k such that exactly n primes are the sum of all but one of the numbers from 1 to k-1 that are coprime to k, or -1 if there is no such k.

Table of values

List of values

n	a(n)
1	4
2	8
3	15
4	10
5	18
6	22
7	34
8	42
9	39
10	64
11	60
12	66
13	74
14	82
15	75
16	115
17	102
18	136
19	106
20	156
21	162
22	160
23	203
24	190
25	186
26	210
27	213
28	268
29	226
30	246
31	240
32	291
33	304
34	300
35	306
36	312
37	364
38	330
39	344
40	342
41	362
42	368
43	386
44	412
45	448
46	420
47	466
48	450
49	472
50	474
51	496
52	518
53	495
54	539
55	483
56	510
57	594
58	660
59	564
60	609
61	655
62	708
63	636

n	a(n)
1	4
2	8
3	15
4	10
5	18
6	22
7	34
8	42
9	39
10	64
11	60
12	66
13	74
14	82
15	75
16	115
17	102
18	136
19	106
20	156
21	162
22	160
23	203
24	190
25	186
26	210
27	213
28	268
29	226
30	246
31	240
32	291
33	304
34	300
35	306
36	312
37	364
38	330
39	344
40	342
41	362
42	368
43	386
44	412
45	448
46	420
47	466
48	450
49	472
50	474
51	496
52	518
53	495
54	539
55	483
56	510
57	594
58	660
59	564
60	609
61	655
62	708
63	636

n	a(n)
1	4
2	8
3	15
4	10
5	18
6	22
7	34
8	42
9	39
10	64
11	60
12	66
13	74
14	82
15	75
16	115
17	102
18	136
19	106
20	156
21	162
22	160
23	203
24	190
25	186
26	210
27	213
28	268
29	226
30	246
31	240
32	291
33	304
34	300
35	306
36	312
37	364
38	330
39	344
40	342
41	362
42	368
43	386
44	412
45	448
46	420
47	466
48	450
49	472
50	474
51	496
52	518
53	495
54	539
55	483
56	510
57	594
58	660
59	564
60	609
61	655
62	708
63	636