A074661 - cp's OEIS frontend

A074661 Let n = 2^e_2 * 3^e_3 * 5^e_5 * ... be the prime factorization of n; sequence gives n such that max{e_2, e_3, ...} is prime.

n	a(n)
1	4
2	8
3	9
4	12
5	18
6	20
7	24
8	25
9	27
10	28
11	32
12	36
13	40
14	44
15	45
16	49
17	50
18	52
19	54
20	56
21	60
22	63
23	68
24	72
25	75
26	76
27	84
28	88
29	90
30	92
31	96
32	98
33	99
34	100
35	104
36	108
37	116
38	117
39	120
40	121
41	124
42	125
43	126
44	128
45	132
46	135
47	136
48	140
49	147
50	148
51	150
52	152
53	153
54	156
55	160
56	164
57	168
58	169
59	171
60	172
61	175
62	180
63	184

[4, 8, 9, 12, 18, 20, 24, 25, 27, 28, 32, 36, 40, 44, 45, 49, 50, 52, 54, 56, 60, 63, 68, 72, 75, 76, 84, 88, 90, 92, 96, 98, 99, 100, 104, 108, 116, 117, 120, 121, 124, 125, 126, 128, 132, 135, 136, 140, 147, 148, 150, 152, 153, 156, 160, 164, 168, 169, 171, 172, 175, 180, 184]

cp's OEIS Frontend

A074661 Let n = 2^e_2 * 3^e_3 * 5^e_5 * ... be the prime factorization of n; sequence gives n such that max{e_2, e_3, ...} is prime.

Table of values

List of values

n	a(n)
1	4
2	8
3	9
4	12
5	18
6	20
7	24
8	25
9	27
10	28
11	32
12	36
13	40
14	44
15	45
16	49
17	50
18	52
19	54
20	56
21	60
22	63
23	68
24	72
25	75
26	76
27	84
28	88
29	90
30	92
31	96
32	98
33	99
34	100
35	104
36	108
37	116
38	117
39	120
40	121
41	124
42	125
43	126
44	128
45	132
46	135
47	136
48	140
49	147
50	148
51	150
52	152
53	153
54	156
55	160
56	164
57	168
58	169
59	171
60	172
61	175
62	180
63	184

n	a(n)
1	4
2	8
3	9
4	12
5	18
6	20
7	24
8	25
9	27
10	28
11	32
12	36
13	40
14	44
15	45
16	49
17	50
18	52
19	54
20	56
21	60
22	63
23	68
24	72
25	75
26	76
27	84
28	88
29	90
30	92
31	96
32	98
33	99
34	100
35	104
36	108
37	116
38	117
39	120
40	121
41	124
42	125
43	126
44	128
45	132
46	135
47	136
48	140
49	147
50	148
51	150
52	152
53	153
54	156
55	160
56	164
57	168
58	169
59	171
60	172
61	175
62	180
63	184

n	a(n)
1	4
2	8
3	9
4	12
5	18
6	20
7	24
8	25
9	27
10	28
11	32
12	36
13	40
14	44
15	45
16	49
17	50
18	52
19	54
20	56
21	60
22	63
23	68
24	72
25	75
26	76
27	84
28	88
29	90
30	92
31	96
32	98
33	99
34	100
35	104
36	108
37	116
38	117
39	120
40	121
41	124
42	125
43	126
44	128
45	132
46	135
47	136
48	140
49	147
50	148
51	150
52	152
53	153
54	156
55	160
56	164
57	168
58	169
59	171
60	172
61	175
62	180
63	184