A343217 - cp's OEIS frontend

A343217 Numbers k such that A003415(sigma(k)) >= k, where A003415(x) gives the arithmetic derivative of x.

n	a(n)
1	3
2	5
3	6
4	7
5	8
6	10
7	11
8	12
9	14
10	15
11	17
12	19
13	20
14	21
15	22
16	23
17	24
18	26
19	27
20	28
21	29
22	30
23	31
24	32
25	33
26	34
27	35
28	38
29	39
30	40
31	41
32	42
33	43
34	44
35	45
36	46
37	47
38	48
39	51
40	52
41	53
42	54
43	55
44	56
45	57
46	58
47	59
48	60
49	62
50	63
51	65
52	66
53	67
54	68
55	69
56	70
57	71
58	72
59	74
60	75
61	76
62	77
63	78
64	79
65	80
66	82
67	83
68	84
69	85
70	86
71	87
72	88
73	89
74	90
75	91
76	92
77	93
78	94
79	95
80	96
81	98
82	99

[3, 5, 6, 7, 8, 10, 11, 12, 14, 15, 17, 19, 20, 21, 22, 23, 24, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 62, 63, 65, 66, 67, 68, 69, 70, 71, 72, 74, 75, 76, 77, 78, 79, 80, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 98, 99]

cp's OEIS Frontend

A343217 Numbers k such that A003415(sigma(k)) >= k, where A003415(x) gives the arithmetic derivative of x.

Table of values

List of values

n	a(n)
1	3
2	5
3	6
4	7
5	8
6	10
7	11
8	12
9	14
10	15
11	17
12	19
13	20
14	21
15	22
16	23
17	24
18	26
19	27
20	28
21	29
22	30
23	31
24	32
25	33
26	34
27	35
28	38
29	39
30	40
31	41
32	42
33	43
34	44
35	45
36	46
37	47
38	48
39	51
40	52
41	53
42	54
43	55
44	56
45	57
46	58
47	59
48	60
49	62
50	63
51	65
52	66
53	67
54	68
55	69
56	70
57	71
58	72
59	74
60	75
61	76
62	77
63	78
64	79
65	80
66	82
67	83
68	84
69	85
70	86
71	87
72	88
73	89
74	90
75	91
76	92
77	93
78	94
79	95
80	96
81	98
82	99

n	a(n)
1	3
2	5
3	6
4	7
5	8
6	10
7	11
8	12
9	14
10	15
11	17
12	19
13	20
14	21
15	22
16	23
17	24
18	26
19	27
20	28
21	29
22	30
23	31
24	32
25	33
26	34
27	35
28	38
29	39
30	40
31	41
32	42
33	43
34	44
35	45
36	46
37	47
38	48
39	51
40	52
41	53
42	54
43	55
44	56
45	57
46	58
47	59
48	60
49	62
50	63
51	65
52	66
53	67
54	68
55	69
56	70
57	71
58	72
59	74
60	75
61	76
62	77
63	78
64	79
65	80
66	82
67	83
68	84
69	85
70	86
71	87
72	88
73	89
74	90
75	91
76	92
77	93
78	94
79	95
80	96
81	98
82	99

n	a(n)
1	3
2	5
3	6
4	7
5	8
6	10
7	11
8	12
9	14
10	15
11	17
12	19
13	20
14	21
15	22
16	23
17	24
18	26
19	27
20	28
21	29
22	30
23	31
24	32
25	33
26	34
27	35
28	38
29	39
30	40
31	41
32	42
33	43
34	44
35	45
36	46
37	47
38	48
39	51
40	52
41	53
42	54
43	55
44	56
45	57
46	58
47	59
48	60
49	62
50	63
51	65
52	66
53	67
54	68
55	69
56	70
57	71
58	72
59	74
60	75
61	76
62	77
63	78
64	79
65	80
66	82
67	83
68	84
69	85
70	86
71	87
72	88
73	89
74	90
75	91
76	92
77	93
78	94
79	95
80	96
81	98
82	99