A074998 - cp's OEIS frontend

A074998 Composite numbers which are sandwiched between two numbers having the same unordered canonical form.

n	a(n)
1	4
2	6
3	12
4	18
5	30
6	34
7	42
8	51
9	55
10	56
11	60
12	72
13	86
14	92
15	94
16	102
17	108
18	138
19	142
20	144
21	150
22	160
23	180
24	184
25	186
26	192
27	198
28	202
29	204
30	214
31	216
32	218
33	220
34	228
35	236
36	240
37	243
38	248
39	249
40	266
41	270
42	282
43	300
44	302
45	304
46	312
47	320
48	322
49	328
50	340
51	341
52	348
53	392
54	394
55	412

[4, 6, 12, 18, 30, 34, 42, 51, 55, 56, 60, 72, 86, 92, 94, 102, 108, 138, 142, 144, 150, 160, 180, 184, 186, 192, 198, 202, 204, 214, 216, 218, 220, 228, 236, 240, 243, 248, 249, 266, 270, 282, 300, 302, 304, 312, 320, 322, 328, 340, 341, 348, 392, 394, 412]

cp's OEIS Frontend

A074998 Composite numbers which are sandwiched between two numbers having the same unordered canonical form.

Table of values

List of values

n	a(n)
1	4
2	6
3	12
4	18
5	30
6	34
7	42
8	51
9	55
10	56
11	60
12	72
13	86
14	92
15	94
16	102
17	108
18	138
19	142
20	144
21	150
22	160
23	180
24	184
25	186
26	192
27	198
28	202
29	204
30	214
31	216
32	218
33	220
34	228
35	236
36	240
37	243
38	248
39	249
40	266
41	270
42	282
43	300
44	302
45	304
46	312
47	320
48	322
49	328
50	340
51	341
52	348
53	392
54	394
55	412

n	a(n)
1	4
2	6
3	12
4	18
5	30
6	34
7	42
8	51
9	55
10	56
11	60
12	72
13	86
14	92
15	94
16	102
17	108
18	138
19	142
20	144
21	150
22	160
23	180
24	184
25	186
26	192
27	198
28	202
29	204
30	214
31	216
32	218
33	220
34	228
35	236
36	240
37	243
38	248
39	249
40	266
41	270
42	282
43	300
44	302
45	304
46	312
47	320
48	322
49	328
50	340
51	341
52	348
53	392
54	394
55	412

n	a(n)
1	4
2	6
3	12
4	18
5	30
6	34
7	42
8	51
9	55
10	56
11	60
12	72
13	86
14	92
15	94
16	102
17	108
18	138
19	142
20	144
21	150
22	160
23	180
24	184
25	186
26	192
27	198
28	202
29	204
30	214
31	216
32	218
33	220
34	228
35	236
36	240
37	243
38	248
39	249
40	266
41	270
42	282
43	300
44	302
45	304
46	312
47	320
48	322
49	328
50	340
51	341
52	348
53	392
54	394
55	412