A189562 - cp's OEIS frontend

A189562 Irregular triangle in which row n has even numbers k that have n solutions to the equation x' = k, where x' denotes the arithmetic derivative (A003415).

n	a(n)
0	2
1	4
2	6
3	8
4	10
5	12
6	14
7	18
8	20
9	28
10	38
11	16
12	22
13	26
14	30
15	40
16	52
17	62
18	68
19	98
20	24
21	32
22	34
23	36
24	42
25	44
26	46
27	50
28	56
29	58
30	88
31	122
32	128
33	54
34	64
35	70
36	74
37	76
38	82
39	86
40	94
41	104
42	136
43	148
44	152
45	158
46	48
47	66
48	80
49	92
50	100
51	106
52	110
53	116
54	118
55	124
56	134
57	146
58	164
59	166
60	172
61	182

[2, 4, 6, 8, 10, 12, 14, 18, 20, 28, 38, 16, 22, 26, 30, 40, 52, 62, 68, 98, 24, 32, 34, 36, 42, 44, 46, 50, 56, 58, 88, 122, 128, 54, 64, 70, 74, 76, 82, 86, 94, 104, 136, 148, 152, 158, 48, 66, 80, 92, 100, 106, 110, 116, 118, 124, 134, 146, 164, 166, 172, 182]

cp's OEIS Frontend

A189562 Irregular triangle in which row n has even numbers k that have n solutions to the equation x' = k, where x' denotes the arithmetic derivative (A003415).

Table of values

List of values

n	a(n)
0	2
1	4
2	6
3	8
4	10
5	12
6	14
7	18
8	20
9	28
10	38
11	16
12	22
13	26
14	30
15	40
16	52
17	62
18	68
19	98
20	24
21	32
22	34
23	36
24	42
25	44
26	46
27	50
28	56
29	58
30	88
31	122
32	128
33	54
34	64
35	70
36	74
37	76
38	82
39	86
40	94
41	104
42	136
43	148
44	152
45	158
46	48
47	66
48	80
49	92
50	100
51	106
52	110
53	116
54	118
55	124
56	134
57	146
58	164
59	166
60	172
61	182

n	a(n)
0	2
1	4
2	6
3	8
4	10
5	12
6	14
7	18
8	20
9	28
10	38
11	16
12	22
13	26
14	30
15	40
16	52
17	62
18	68
19	98
20	24
21	32
22	34
23	36
24	42
25	44
26	46
27	50
28	56
29	58
30	88
31	122
32	128
33	54
34	64
35	70
36	74
37	76
38	82
39	86
40	94
41	104
42	136
43	148
44	152
45	158
46	48
47	66
48	80
49	92
50	100
51	106
52	110
53	116
54	118
55	124
56	134
57	146
58	164
59	166
60	172
61	182

n	a(n)
0	2
1	4
2	6
3	8
4	10
5	12
6	14
7	18
8	20
9	28
10	38
11	16
12	22
13	26
14	30
15	40
16	52
17	62
18	68
19	98
20	24
21	32
22	34
23	36
24	42
25	44
26	46
27	50
28	56
29	58
30	88
31	122
32	128
33	54
34	64
35	70
36	74
37	76
38	82
39	86
40	94
41	104
42	136
43	148
44	152
45	158
46	48
47	66
48	80
49	92
50	100
51	106
52	110
53	116
54	118
55	124
56	134
57	146
58	164
59	166
60	172
61	182