A256872 - cp's OEIS frontend

A256872 Numbers whose binary expansion is the concatenation of the binary expansion of two prime numbers in at least two ways.

n	a(n)
1	23
2	31
3	45
4	47
5	61
6	93
7	95
8	119
9	125
10	127
11	175
12	187
13	189
14	191
15	239
16	247
17	253
18	255
19	335
20	357
21	359
22	363
23	369
24	379
25	381
26	383
27	431
28	439
29	455
30	477
31	485
32	491
33	493
34	495
35	507
36	509
37	511
38	573
39	575
40	631
41	637
42	639
43	669
44	671

[23, 31, 45, 47, 61, 93, 95, 119, 125, 127, 175, 187, 189, 191, 239, 247, 253, 255, 335, 357, 359, 363, 369, 379, 381, 383, 431, 439, 455, 477, 485, 491, 493, 495, 507, 509, 511, 573, 575, 631, 637, 639, 669, 671]

cp's OEIS Frontend

A256872 Numbers whose binary expansion is the concatenation of the binary expansion of two prime numbers in at least two ways.

Table of values

List of values

n	a(n)
1	23
2	31
3	45
4	47
5	61
6	93
7	95
8	119
9	125
10	127
11	175
12	187
13	189
14	191
15	239
16	247
17	253
18	255
19	335
20	357
21	359
22	363
23	369
24	379
25	381
26	383
27	431
28	439
29	455
30	477
31	485
32	491
33	493
34	495
35	507
36	509
37	511
38	573
39	575
40	631
41	637
42	639
43	669
44	671

n	a(n)
1	23
2	31
3	45
4	47
5	61
6	93
7	95
8	119
9	125
10	127
11	175
12	187
13	189
14	191
15	239
16	247
17	253
18	255
19	335
20	357
21	359
22	363
23	369
24	379
25	381
26	383
27	431
28	439
29	455
30	477
31	485
32	491
33	493
34	495
35	507
36	509
37	511
38	573
39	575
40	631
41	637
42	639
43	669
44	671

n	a(n)
1	23
2	31
3	45
4	47
5	61
6	93
7	95
8	119
9	125
10	127
11	175
12	187
13	189
14	191
15	239
16	247
17	253
18	255
19	335
20	357
21	359
22	363
23	369
24	379
25	381
26	383
27	431
28	439
29	455
30	477
31	485
32	491
33	493
34	495
35	507
36	509
37	511
38	573
39	575
40	631
41	637
42	639
43	669
44	671