A242677 - cp's OEIS frontend

A242677 Semiprimes whose binary representation, read in decimal, is also semiprime.

n	a(n)
1	15
2	33
3	55
4	57
5	65
6	69
7	77
8	87
9	115
10	121
11	129
12	143
13	169
14	205
15	209
16	265
17	299
18	305
19	321
20	339
21	361
22	415
23	417
24	447
25	451
26	481
27	493
28	505
29	517
30	519
31	535
32	551
33	553
34	581
35	611
36	623
37	667
38	687
39	695
40	721
41	737
42	779
43	789
44	799
45	865
46	871
47	893
48	901
49	905
50	923
51	943
52	949
53	955
54	973

[15, 33, 55, 57, 65, 69, 77, 87, 115, 121, 129, 143, 169, 205, 209, 265, 299, 305, 321, 339, 361, 415, 417, 447, 451, 481, 493, 505, 517, 519, 535, 551, 553, 581, 611, 623, 667, 687, 695, 721, 737, 779, 789, 799, 865, 871, 893, 901, 905, 923, 943, 949, 955, 973]

cp's OEIS Frontend

A242677 Semiprimes whose binary representation, read in decimal, is also semiprime.

Table of values

List of values

n	a(n)
1	15
2	33
3	55
4	57
5	65
6	69
7	77
8	87
9	115
10	121
11	129
12	143
13	169
14	205
15	209
16	265
17	299
18	305
19	321
20	339
21	361
22	415
23	417
24	447
25	451
26	481
27	493
28	505
29	517
30	519
31	535
32	551
33	553
34	581
35	611
36	623
37	667
38	687
39	695
40	721
41	737
42	779
43	789
44	799
45	865
46	871
47	893
48	901
49	905
50	923
51	943
52	949
53	955
54	973

n	a(n)
1	15
2	33
3	55
4	57
5	65
6	69
7	77
8	87
9	115
10	121
11	129
12	143
13	169
14	205
15	209
16	265
17	299
18	305
19	321
20	339
21	361
22	415
23	417
24	447
25	451
26	481
27	493
28	505
29	517
30	519
31	535
32	551
33	553
34	581
35	611
36	623
37	667
38	687
39	695
40	721
41	737
42	779
43	789
44	799
45	865
46	871
47	893
48	901
49	905
50	923
51	943
52	949
53	955
54	973

n	a(n)
1	15
2	33
3	55
4	57
5	65
6	69
7	77
8	87
9	115
10	121
11	129
12	143
13	169
14	205
15	209
16	265
17	299
18	305
19	321
20	339
21	361
22	415
23	417
24	447
25	451
26	481
27	493
28	505
29	517
30	519
31	535
32	551
33	553
34	581
35	611
36	623
37	667
38	687
39	695
40	721
41	737
42	779
43	789
44	799
45	865
46	871
47	893
48	901
49	905
50	923
51	943
52	949
53	955
54	973