A068354 - cp's OEIS frontend

A068354 Numbers n such that sigma(n)tau(n) > prime(2n) where sigma(n) is the sum of divisors of n and tau(n) the number of divisors of n (A000005).

n	a(n)
1	4
2	6
3	8
4	10
5	12
6	16
7	18
8	20
9	24
10	28
11	30
12	32
13	36
14	40
15	42
16	44
17	45
18	48
19	50
20	52
21	54
22	56
23	60
24	64
25	66
26	70
27	72
28	78
29	80
30	84
31	88
32	90
33	96
34	100
35	102
36	104
37	105
38	108
39	110
40	112
41	114
42	120
43	126
44	128
45	130
46	132
47	135
48	136
49	138
50	140
51	144
52	150
53	152
54	154
55	156
56	160
57	162
58	165
59	168
60	170

[4, 6, 8, 10, 12, 16, 18, 20, 24, 28, 30, 32, 36, 40, 42, 44, 45, 48, 50, 52, 54, 56, 60, 64, 66, 70, 72, 78, 80, 84, 88, 90, 96, 100, 102, 104, 105, 108, 110, 112, 114, 120, 126, 128, 130, 132, 135, 136, 138, 140, 144, 150, 152, 154, 156, 160, 162, 165, 168, 170]

cp's OEIS Frontend

A068354 Numbers n such that sigma(n)tau(n) > prime(2n) where sigma(n) is the sum of divisors of n and tau(n) the number of divisors of n (A000005).

Table of values

List of values

n	a(n)
1	4
2	6
3	8
4	10
5	12
6	16
7	18
8	20
9	24
10	28
11	30
12	32
13	36
14	40
15	42
16	44
17	45
18	48
19	50
20	52
21	54
22	56
23	60
24	64
25	66
26	70
27	72
28	78
29	80
30	84
31	88
32	90
33	96
34	100
35	102
36	104
37	105
38	108
39	110
40	112
41	114
42	120
43	126
44	128
45	130
46	132
47	135
48	136
49	138
50	140
51	144
52	150
53	152
54	154
55	156
56	160
57	162
58	165
59	168
60	170

n	a(n)
1	4
2	6
3	8
4	10
5	12
6	16
7	18
8	20
9	24
10	28
11	30
12	32
13	36
14	40
15	42
16	44
17	45
18	48
19	50
20	52
21	54
22	56
23	60
24	64
25	66
26	70
27	72
28	78
29	80
30	84
31	88
32	90
33	96
34	100
35	102
36	104
37	105
38	108
39	110
40	112
41	114
42	120
43	126
44	128
45	130
46	132
47	135
48	136
49	138
50	140
51	144
52	150
53	152
54	154
55	156
56	160
57	162
58	165
59	168
60	170

cp's OEIS Frontend

A068354 Numbers n such that sigma(n)*tau(n) > prime(2*n) where sigma(n) is the sum of divisors of n and tau(n) the number of divisors of n (A000005).

Table of values

List of values

A068354 Numbers n such that sigma(n)tau(n) > prime(2n) where sigma(n) is the sum of divisors of n and tau(n) the number of divisors of n (A000005).

n	a(n)
1	4
2	6
3	8
4	10
5	12
6	16
7	18
8	20
9	24
10	28
11	30
12	32
13	36
14	40
15	42
16	44
17	45
18	48
19	50
20	52
21	54
22	56
23	60
24	64
25	66
26	70
27	72
28	78
29	80
30	84
31	88
32	90
33	96
34	100
35	102
36	104
37	105
38	108
39	110
40	112
41	114
42	120
43	126
44	128
45	130
46	132
47	135
48	136
49	138
50	140
51	144
52	150
53	152
54	154
55	156
56	160
57	162
58	165
59	168
60	170