A355441 - cp's OEIS frontend

A355441 Numbers k such that the sum of the least prime factors of i=2..k is prime.

n	a(n)
1	2
2	3
3	4
4	8
5	12
6	15
7	16
8	20
9	24
10	40
11	43
12	52
13	55
14	60
15	63
16	68
17	72
18	79
19	87
20	95
21	96
22	108
23	111
24	120
25	123
26	136
27	140
28	148
29	151
30	160
31	184
32	211
33	215
34	216
35	227
36	232
37	235
38	239
39	252
40	255
41	256
42	260
43	264
44	280
45	283
46	288
47	299
48	307
49	323
50	324
51	327
52	332
53	360
54	363
55	371
56	372
57	375
58	379

[2, 3, 4, 8, 12, 15, 16, 20, 24, 40, 43, 52, 55, 60, 63, 68, 72, 79, 87, 95, 96, 108, 111, 120, 123, 136, 140, 148, 151, 160, 184, 211, 215, 216, 227, 232, 235, 239, 252, 255, 256, 260, 264, 280, 283, 288, 299, 307, 323, 324, 327, 332, 360, 363, 371, 372, 375, 379]

cp's OEIS Frontend

A355441 Numbers k such that the sum of the least prime factors of i=2..k is prime.

Table of values

List of values

n	a(n)
1	2
2	3
3	4
4	8
5	12
6	15
7	16
8	20
9	24
10	40
11	43
12	52
13	55
14	60
15	63
16	68
17	72
18	79
19	87
20	95
21	96
22	108
23	111
24	120
25	123
26	136
27	140
28	148
29	151
30	160
31	184
32	211
33	215
34	216
35	227
36	232
37	235
38	239
39	252
40	255
41	256
42	260
43	264
44	280
45	283
46	288
47	299
48	307
49	323
50	324
51	327
52	332
53	360
54	363
55	371
56	372
57	375
58	379

n	a(n)
1	2
2	3
3	4
4	8
5	12
6	15
7	16
8	20
9	24
10	40
11	43
12	52
13	55
14	60
15	63
16	68
17	72
18	79
19	87
20	95
21	96
22	108
23	111
24	120
25	123
26	136
27	140
28	148
29	151
30	160
31	184
32	211
33	215
34	216
35	227
36	232
37	235
38	239
39	252
40	255
41	256
42	260
43	264
44	280
45	283
46	288
47	299
48	307
49	323
50	324
51	327
52	332
53	360
54	363
55	371
56	372
57	375
58	379

n	a(n)
1	2
2	3
3	4
4	8
5	12
6	15
7	16
8	20
9	24
10	40
11	43
12	52
13	55
14	60
15	63
16	68
17	72
18	79
19	87
20	95
21	96
22	108
23	111
24	120
25	123
26	136
27	140
28	148
29	151
30	160
31	184
32	211
33	215
34	216
35	227
36	232
37	235
38	239
39	252
40	255
41	256
42	260
43	264
44	280
45	283
46	288
47	299
48	307
49	323
50	324
51	327
52	332
53	360
54	363
55	371
56	372
57	375
58	379