A180221 - cp's OEIS frontend

A180221 Numbers that can be written as sum of one or more distinct elements of A000043. Numbers k for which sigma(A180162(k))=2^k, k>=2.

n	a(n)
1	2
2	3
3	5
4	7
5	8
6	9
7	10
8	12
9	13
10	14
11	15
12	16
13	17
14	18
15	19
16	20
17	21
18	22
19	23
20	24
21	25
22	26
23	27
24	28
25	29
26	30
27	31
28	32
29	33
30	34
31	35
32	36
33	37
34	38
35	39
36	40
37	41
38	42
39	43
40	44
41	45
42	46
43	47
44	48
45	49
46	50
47	51
48	52
49	53
50	54
51	55
52	56
53	57
54	58
55	59
56	60
57	61
58	62
59	63
60	64
61	65
62	66
63	67
64	68
65	69
66	70
67	71
68	72
69	73
70	74
71	75

[2, 3, 5, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75]

cp's OEIS Frontend

A180221 Numbers that can be written as sum of one or more distinct elements of A000043. Numbers k for which sigma(A180162(k))=2^k, k>=2.

Table of values

List of values

n	a(n)
1	2
2	3
3	5
4	7
5	8
6	9
7	10
8	12
9	13
10	14
11	15
12	16
13	17
14	18
15	19
16	20
17	21
18	22
19	23
20	24
21	25
22	26
23	27
24	28
25	29
26	30
27	31
28	32
29	33
30	34
31	35
32	36
33	37
34	38
35	39
36	40
37	41
38	42
39	43
40	44
41	45
42	46
43	47
44	48
45	49
46	50
47	51
48	52
49	53
50	54
51	55
52	56
53	57
54	58
55	59
56	60
57	61
58	62
59	63
60	64
61	65
62	66
63	67
64	68
65	69
66	70
67	71
68	72
69	73
70	74
71	75

n	a(n)
1	2
2	3
3	5
4	7
5	8
6	9
7	10
8	12
9	13
10	14
11	15
12	16
13	17
14	18
15	19
16	20
17	21
18	22
19	23
20	24
21	25
22	26
23	27
24	28
25	29
26	30
27	31
28	32
29	33
30	34
31	35
32	36
33	37
34	38
35	39
36	40
37	41
38	42
39	43
40	44
41	45
42	46
43	47
44	48
45	49
46	50
47	51
48	52
49	53
50	54
51	55
52	56
53	57
54	58
55	59
56	60
57	61
58	62
59	63
60	64
61	65
62	66
63	67
64	68
65	69
66	70
67	71
68	72
69	73
70	74
71	75

n	a(n)
1	2
2	3
3	5
4	7
5	8
6	9
7	10
8	12
9	13
10	14
11	15
12	16
13	17
14	18
15	19
16	20
17	21
18	22
19	23
20	24
21	25
22	26
23	27
24	28
25	29
26	30
27	31
28	32
29	33
30	34
31	35
32	36
33	37
34	38
35	39
36	40
37	41
38	42
39	43
40	44
41	45
42	46
43	47
44	48
45	49
46	50
47	51
48	52
49	53
50	54
51	55
52	56
53	57
54	58
55	59
56	60
57	61
58	62
59	63
60	64
61	65
62	66
63	67
64	68
65	69
66	70
67	71
68	72
69	73
70	74
71	75