A342609 - cp's OEIS frontend

A342609 Positive integers that cannot be written in the form k - gpf(k) +- 1 for some integer k, where gpf(k) is the greatest prime factor of k.

n	a(n)
1	17
2	49
3	161
4	197
5	199
6	209
7	251
8	391
9	419
10	449
11	649
12	685
13	769
14	799
15	883
16	967
17	1057
18	1189
19	1249
20	1301
21	1457
22	1481
23	1681
24	1793
25	1937
26	1979
27	2001
28	2029
29	2089
30	2177
31	2209
32	2311
33	2377
34	2379
35	2419
36	2431
37	2449
38	2549
39	2551
40	2575
41	2591
42	2705
43	2729
44	2899
45	3041
46	3073

[17, 49, 161, 197, 199, 209, 251, 391, 419, 449, 649, 685, 769, 799, 883, 967, 1057, 1189, 1249, 1301, 1457, 1481, 1681, 1793, 1937, 1979, 2001, 2029, 2089, 2177, 2209, 2311, 2377, 2379, 2419, 2431, 2449, 2549, 2551, 2575, 2591, 2705, 2729, 2899, 3041, 3073]

cp's OEIS Frontend

A342609 Positive integers that cannot be written in the form k - gpf(k) +- 1 for some integer k, where gpf(k) is the greatest prime factor of k.

Table of values

List of values