A254750 - cp's OEIS frontend

A254750 Numbers such that, in base 10, all their proper prefixes and suffixes represent composites.

n	a(n)
1	44
2	46
3	48
4	49
5	64
6	66
7	68
8	69
9	84
10	86
11	88
12	89
13	94
14	96
15	98
16	99
17	404
18	406
19	408
20	409
21	424
22	426
23	428
24	444
25	446
26	448
27	449
28	454
29	456
30	458
31	464
32	466
33	468
34	469
35	484
36	486
37	488
38	494
39	496
40	498
41	499
42	604
43	606
44	608
45	609
46	624
47	626
48	628
49	634
50	636
51	638

[44, 46, 48, 49, 64, 66, 68, 69, 84, 86, 88, 89, 94, 96, 98, 99, 404, 406, 408, 409, 424, 426, 428, 444, 446, 448, 449, 454, 456, 458, 464, 466, 468, 469, 484, 486, 488, 494, 496, 498, 499, 604, 606, 608, 609, 624, 626, 628, 634, 636, 638]

cp's OEIS Frontend

A254750 Numbers such that, in base 10, all their proper prefixes and suffixes represent composites.

Table of values

List of values

n	a(n)
1	44
2	46
3	48
4	49
5	64
6	66
7	68
8	69
9	84
10	86
11	88
12	89
13	94
14	96
15	98
16	99
17	404
18	406
19	408
20	409
21	424
22	426
23	428
24	444
25	446
26	448
27	449
28	454
29	456
30	458
31	464
32	466
33	468
34	469
35	484
36	486
37	488
38	494
39	496
40	498
41	499
42	604
43	606
44	608
45	609
46	624
47	626
48	628
49	634
50	636
51	638

n	a(n)
1	44
2	46
3	48
4	49
5	64
6	66
7	68
8	69
9	84
10	86
11	88
12	89
13	94
14	96
15	98
16	99
17	404
18	406
19	408
20	409
21	424
22	426
23	428
24	444
25	446
26	448
27	449
28	454
29	456
30	458
31	464
32	466
33	468
34	469
35	484
36	486
37	488
38	494
39	496
40	498
41	499
42	604
43	606
44	608
45	609
46	624
47	626
48	628
49	634
50	636
51	638

n	a(n)
1	44
2	46
3	48
4	49
5	64
6	66
7	68
8	69
9	84
10	86
11	88
12	89
13	94
14	96
15	98
16	99
17	404
18	406
19	408
20	409
21	424
22	426
23	428
24	444
25	446
26	448
27	449
28	454
29	456
30	458
31	464
32	466
33	468
34	469
35	484
36	486
37	488
38	494
39	496
40	498
41	499
42	604
43	606
44	608
45	609
46	624
47	626
48	628
49	634
50	636
51	638