A264865 - cp's OEIS frontend

A264865 Primes of the form 2^x + y (x >= 0 and 0 <= y < 2^x) such that all the numbers 2^(x-a) + (y+a) (0 < a <= x) are composite.

n	a(n)
1	5
2	7
3	13
4	19
5	31
6	47
7	61
8	71
9	101
10	211
11	239
12	241
13	271
14	281
15	311
16	331
17	379
18	421
19	449
20	491
21	617
22	619
23	631
24	751
25	797
26	827
27	853
28	863
29	883
30	971
31	991
32	1009
33	1051
34	1117
35	1171
36	1217
37	1277
38	1291
39	1297
40	1301
41	1321
42	1327
43	1429
44	1453
45	1471
46	1483
47	1487
48	1531
49	1567
50	1607
51	1627
52	1637
53	1667
54	1669
55	1697
56	1709
57	1723
58	1747
59	1801
60	1847

[5, 7, 13, 19, 31, 47, 61, 71, 101, 211, 239, 241, 271, 281, 311, 331, 379, 421, 449, 491, 617, 619, 631, 751, 797, 827, 853, 863, 883, 971, 991, 1009, 1051, 1117, 1171, 1217, 1277, 1291, 1297, 1301, 1321, 1327, 1429, 1453, 1471, 1483, 1487, 1531, 1567, 1607, 1627, 1637, 1667, 1669, 1697, 1709, 1723, 1747, 1801, 1847]

cp's OEIS Frontend

A264865 Primes of the form 2^x + y (x >= 0 and 0 <= y < 2^x) such that all the numbers 2^(x-a) + (y+a) (0 < a <= x) are composite.

Table of values

List of values