A347873 - cp's OEIS frontend

A347873 Numbers k such that k and A003415(sigma(k)) are of different parity.

n	a(n)
1	1
2	2
3	3
4	4
5	7
6	10
7	11
8	15
9	16
10	19
11	20
12	21
13	23
14	26
15	27
16	31
17	32
18	33
19	34
20	35
21	39
22	40
23	43
24	47
25	49
26	51
27	52
28	55
29	57
30	58
31	59
32	63
33	64
34	65
35	67
36	68
37	69
38	71
39	72
40	74
41	75
42	77
43	79
44	80
45	81
46	82
47	83
48	85
49	87
50	90
51	91
52	93
53	95
54	98
55	99
56	103
57	104
58	105
59	106
60	107
61	111
62	115
63	116
64	119
65	121
66	122
67	123
68	125
69	127
70	128
71	129
72	131
73	133
74	135
75	136

[1, 2, 3, 4, 7, 10, 11, 15, 16, 19, 20, 21, 23, 26, 27, 31, 32, 33, 34, 35, 39, 40, 43, 47, 49, 51, 52, 55, 57, 58, 59, 63, 64, 65, 67, 68, 69, 71, 72, 74, 75, 77, 79, 80, 81, 82, 83, 85, 87, 90, 91, 93, 95, 98, 99, 103, 104, 105, 106, 107, 111, 115, 116, 119, 121, 122, 123, 125, 127, 128, 129, 131, 133, 135, 136]

cp's OEIS Frontend

A347873 Numbers k such that k and A003415(sigma(k)) are of different parity.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	7
6	10
7	11
8	15
9	16
10	19
11	20
12	21
13	23
14	26
15	27
16	31
17	32
18	33
19	34
20	35
21	39
22	40
23	43
24	47
25	49
26	51
27	52
28	55
29	57
30	58
31	59
32	63
33	64
34	65
35	67
36	68
37	69
38	71
39	72
40	74
41	75
42	77
43	79
44	80
45	81
46	82
47	83
48	85
49	87
50	90
51	91
52	93
53	95
54	98
55	99
56	103
57	104
58	105
59	106
60	107
61	111
62	115
63	116
64	119
65	121
66	122
67	123
68	125
69	127
70	128
71	129
72	131
73	133
74	135
75	136

n	a(n)
1	1
2	2
3	3
4	4
5	7
6	10
7	11
8	15
9	16
10	19
11	20
12	21
13	23
14	26
15	27
16	31
17	32
18	33
19	34
20	35
21	39
22	40
23	43
24	47
25	49
26	51
27	52
28	55
29	57
30	58
31	59
32	63
33	64
34	65
35	67
36	68
37	69
38	71
39	72
40	74
41	75
42	77
43	79
44	80
45	81
46	82
47	83
48	85
49	87
50	90
51	91
52	93
53	95
54	98
55	99
56	103
57	104
58	105
59	106
60	107
61	111
62	115
63	116
64	119
65	121
66	122
67	123
68	125
69	127
70	128
71	129
72	131
73	133
74	135
75	136

n	a(n)
1	1
2	2
3	3
4	4
5	7
6	10
7	11
8	15
9	16
10	19
11	20
12	21
13	23
14	26
15	27
16	31
17	32
18	33
19	34
20	35
21	39
22	40
23	43
24	47
25	49
26	51
27	52
28	55
29	57
30	58
31	59
32	63
33	64
34	65
35	67
36	68
37	69
38	71
39	72
40	74
41	75
42	77
43	79
44	80
45	81
46	82
47	83
48	85
49	87
50	90
51	91
52	93
53	95
54	98
55	99
56	103
57	104
58	105
59	106
60	107
61	111
62	115
63	116
64	119
65	121
66	122
67	123
68	125
69	127
70	128
71	129
72	131
73	133
74	135
75	136