A152073 - cp's OEIS frontend

A152073 a(n) = largest prime < prime(n) such that prime(n) - a(n) is a power of 2, where prime(n) is the n-th prime; a(n) = 0 if no such prime exists.

n	a(n)
2	2
3	3
4	5
5	7
6	11
7	13
8	17
9	19
10	13
11	29
12	29
13	37
14	41
15	43
16	37
17	43
18	59
19	59
20	67
21	71
22	71
23	79
24	73
25	89
26	97
27	101
28	103
29	107
30	109
31	0
32	127
33	73
34	137
35	0
36	149
37	149
38	131
39	163
40	157
41	163
42	179
43	127
44	191
45	193
46	197
47	179
48	191
49	223
50	227
51	229
52	223
53	239
54	0
55	241
56	199
57	13
58	269
59	269
60	277
61	281
62	277
63	179

[2, 3, 5, 7, 11, 13, 17, 19, 13, 29, 29, 37, 41, 43, 37, 43, 59, 59, 67, 71, 71, 79, 73, 89, 97, 101, 103, 107, 109, 0, 127, 73, 137, 0, 149, 149, 131, 163, 157, 163, 179, 127, 191, 193, 197, 179, 191, 223, 227, 229, 223, 239, 0, 241, 199, 13, 269, 269, 277, 281, 277, 179]

cp's OEIS Frontend

A152073 a(n) = largest prime < prime(n) such that prime(n) - a(n) is a power of 2, where prime(n) is the n-th prime; a(n) = 0 if no such prime exists.

Table of values

List of values

n	a(n)
2	2
3	3
4	5
5	7
6	11
7	13
8	17
9	19
10	13
11	29
12	29
13	37
14	41
15	43
16	37
17	43
18	59
19	59
20	67
21	71
22	71
23	79
24	73
25	89
26	97
27	101
28	103
29	107
30	109
31	0
32	127
33	73
34	137
35	0
36	149
37	149
38	131
39	163
40	157
41	163
42	179
43	127
44	191
45	193
46	197
47	179
48	191
49	223
50	227
51	229
52	223
53	239
54	0
55	241
56	199
57	13
58	269
59	269
60	277
61	281
62	277
63	179

n	a(n)
2	2
3	3
4	5
5	7
6	11
7	13
8	17
9	19
10	13
11	29
12	29
13	37
14	41
15	43
16	37
17	43
18	59
19	59
20	67
21	71
22	71
23	79
24	73
25	89
26	97
27	101
28	103
29	107
30	109
31	0
32	127
33	73
34	137
35	0
36	149
37	149
38	131
39	163
40	157
41	163
42	179
43	127
44	191
45	193
46	197
47	179
48	191
49	223
50	227
51	229
52	223
53	239
54	0
55	241
56	199
57	13
58	269
59	269
60	277
61	281
62	277
63	179

n	a(n)
2	2
3	3
4	5
5	7
6	11
7	13
8	17
9	19
10	13
11	29
12	29
13	37
14	41
15	43
16	37
17	43
18	59
19	59
20	67
21	71
22	71
23	79
24	73
25	89
26	97
27	101
28	103
29	107
30	109
31	0
32	127
33	73
34	137
35	0
36	149
37	149
38	131
39	163
40	157
41	163
42	179
43	127
44	191
45	193
46	197
47	179
48	191
49	223
50	227
51	229
52	223
53	239
54	0
55	241
56	199
57	13
58	269
59	269
60	277
61	281
62	277
63	179