A374593 - cp's OEIS frontend

A374593 Numbers k such that k - rad(k) + 1 is prime, where rad(k) is the radical A007947(k).

n	a(n)
1	4
2	8
3	9
4	12
5	18
6	20
7	24
8	32
9	36
10	40
11	44
12	45
13	48
14	49
15	50
16	56
17	60
18	63
19	72
20	75
21	80
22	81
23	84
24	88
25	90
26	92
27	99
28	104
29	108
30	116
31	117
32	128
33	132
34	136
35	140
36	144
37	147
38	153
39	156
40	160
41	162
42	164
43	168
44	169
45	180
46	184
47	200
48	204
49	207
50	212
51	216
52	224
53	225
54	234
55	240
56	243
57	245
58	250

[4, 8, 9, 12, 18, 20, 24, 32, 36, 40, 44, 45, 48, 49, 50, 56, 60, 63, 72, 75, 80, 81, 84, 88, 90, 92, 99, 104, 108, 116, 117, 128, 132, 136, 140, 144, 147, 153, 156, 160, 162, 164, 168, 169, 180, 184, 200, 204, 207, 212, 216, 224, 225, 234, 240, 243, 245, 250]

cp's OEIS Frontend

A374593 Numbers k such that k - rad(k) + 1 is prime, where rad(k) is the radical A007947(k).

Table of values

List of values

n	a(n)
1	4
2	8
3	9
4	12
5	18
6	20
7	24
8	32
9	36
10	40
11	44
12	45
13	48
14	49
15	50
16	56
17	60
18	63
19	72
20	75
21	80
22	81
23	84
24	88
25	90
26	92
27	99
28	104
29	108
30	116
31	117
32	128
33	132
34	136
35	140
36	144
37	147
38	153
39	156
40	160
41	162
42	164
43	168
44	169
45	180
46	184
47	200
48	204
49	207
50	212
51	216
52	224
53	225
54	234
55	240
56	243
57	245
58	250

n	a(n)
1	4
2	8
3	9
4	12
5	18
6	20
7	24
8	32
9	36
10	40
11	44
12	45
13	48
14	49
15	50
16	56
17	60
18	63
19	72
20	75
21	80
22	81
23	84
24	88
25	90
26	92
27	99
28	104
29	108
30	116
31	117
32	128
33	132
34	136
35	140
36	144
37	147
38	153
39	156
40	160
41	162
42	164
43	168
44	169
45	180
46	184
47	200
48	204
49	207
50	212
51	216
52	224
53	225
54	234
55	240
56	243
57	245
58	250

n	a(n)
1	4
2	8
3	9
4	12
5	18
6	20
7	24
8	32
9	36
10	40
11	44
12	45
13	48
14	49
15	50
16	56
17	60
18	63
19	72
20	75
21	80
22	81
23	84
24	88
25	90
26	92
27	99
28	104
29	108
30	116
31	117
32	128
33	132
34	136
35	140
36	144
37	147
38	153
39	156
40	160
41	162
42	164
43	168
44	169
45	180
46	184
47	200
48	204
49	207
50	212
51	216
52	224
53	225
54	234
55	240
56	243
57	245
58	250