A350069 - cp's OEIS frontend

A350069 Semiprimes k such that 1+(2^(1+A243055(k))) is a Fermat prime, where A243055(k) gives the difference between the indices of the smallest and the largest prime divisor of k.

n	a(n)
1	4
2	6
3	9
4	14
5	15
6	25
7	33
8	35
9	38
10	49
11	65
12	69
13	77
14	106
15	119
16	121
17	143
18	145
19	169
20	177
21	209
22	217
23	221
24	289
25	299
26	305
27	323
28	361
29	407
30	437
31	469
32	493
33	529
34	533
35	589
36	667
37	731
38	781
39	841
40	851
41	893
42	899
43	949
44	961
45	1147
46	1189
47	1219
48	1333
49	1343
50	1369
51	1517
52	1577
53	1681
54	1711
55	1739
56	1763
57	1849
58	1891
59	2021
60	2047
61	2173
62	2209
63	2479

[4, 6, 9, 14, 15, 25, 33, 35, 38, 49, 65, 69, 77, 106, 119, 121, 143, 145, 169, 177, 209, 217, 221, 289, 299, 305, 323, 361, 407, 437, 469, 493, 529, 533, 589, 667, 731, 781, 841, 851, 893, 899, 949, 961, 1147, 1189, 1219, 1333, 1343, 1369, 1517, 1577, 1681, 1711, 1739, 1763, 1849, 1891, 2021, 2047, 2173, 2209, 2479]

cp's OEIS Frontend

A350069 Semiprimes k such that 1+(2^(1+A243055(k))) is a Fermat prime, where A243055(k) gives the difference between the indices of the smallest and the largest prime divisor of k.

Table of values

List of values