A088821 - cp's OEIS frontend

A088821 a(n) is the sum of smallest prime factors of numbers from 1 to n.

n	a(n)
1	0
2	2
3	5
4	7
5	12
6	14
7	21
8	23
9	26
10	28
11	39
12	41
13	54
14	56
15	59
16	61
17	78
18	80
19	99
20	101
21	104
22	106
23	129
24	131
25	136
26	138
27	141
28	143
29	172
30	174
31	205
32	207
33	210
34	212
35	217
36	219
37	256
38	258
39	261
40	263
41	304
42	306
43	349
44	351
45	354
46	356
47	403
48	405
49	412
50	414
51	417
52	419
53	472
54	474
55	479
56	481
57	484

[0, 2, 5, 7, 12, 14, 21, 23, 26, 28, 39, 41, 54, 56, 59, 61, 78, 80, 99, 101, 104, 106, 129, 131, 136, 138, 141, 143, 172, 174, 205, 207, 210, 212, 217, 219, 256, 258, 261, 263, 304, 306, 349, 351, 354, 356, 403, 405, 412, 414, 417, 419, 472, 474, 479, 481, 484]

cp's OEIS Frontend

A088821 a(n) is the sum of smallest prime factors of numbers from 1 to n.

Table of values

List of values

n	a(n)
1	0
2	2
3	5
4	7
5	12
6	14
7	21
8	23
9	26
10	28
11	39
12	41
13	54
14	56
15	59
16	61
17	78
18	80
19	99
20	101
21	104
22	106
23	129
24	131
25	136
26	138
27	141
28	143
29	172
30	174
31	205
32	207
33	210
34	212
35	217
36	219
37	256
38	258
39	261
40	263
41	304
42	306
43	349
44	351
45	354
46	356
47	403
48	405
49	412
50	414
51	417
52	419
53	472
54	474
55	479
56	481
57	484

n	a(n)
1	0
2	2
3	5
4	7
5	12
6	14
7	21
8	23
9	26
10	28
11	39
12	41
13	54
14	56
15	59
16	61
17	78
18	80
19	99
20	101
21	104
22	106
23	129
24	131
25	136
26	138
27	141
28	143
29	172
30	174
31	205
32	207
33	210
34	212
35	217
36	219
37	256
38	258
39	261
40	263
41	304
42	306
43	349
44	351
45	354
46	356
47	403
48	405
49	412
50	414
51	417
52	419
53	472
54	474
55	479
56	481
57	484

n	a(n)
1	0
2	2
3	5
4	7
5	12
6	14
7	21
8	23
9	26
10	28
11	39
12	41
13	54
14	56
15	59
16	61
17	78
18	80
19	99
20	101
21	104
22	106
23	129
24	131
25	136
26	138
27	141
28	143
29	172
30	174
31	205
32	207
33	210
34	212
35	217
36	219
37	256
38	258
39	261
40	263
41	304
42	306
43	349
44	351
45	354
46	356
47	403
48	405
49	412
50	414
51	417
52	419
53	472
54	474
55	479
56	481
57	484