A138046 - cp's OEIS frontend

A138046 Positive integers k such that (d(k+1) - d(k)) * (-1)^k is positive, where d(k) = the number of positive divisors of k.

n	a(n)
1	45
2	62
3	74
4	81
5	105
6	117
7	134
8	146
9	164
10	165
11	188
12	194
13	206
14	225
15	254
16	261
17	273
18	274
19	278
20	284
21	297
22	314
23	315
24	325
25	333
26	345
27	356
28	357
29	362
30	385
31	386
32	398
33	404
34	405
35	422
36	428
37	435
38	441
39	454
40	458
41	465
42	477
43	482
44	494
45	495
46	513
47	524
48	525
49	538
50	554
51	555
52	561

[45, 62, 74, 81, 105, 117, 134, 146, 164, 165, 188, 194, 206, 225, 254, 261, 273, 274, 278, 284, 297, 314, 315, 325, 333, 345, 356, 357, 362, 385, 386, 398, 404, 405, 422, 428, 435, 441, 454, 458, 465, 477, 482, 494, 495, 513, 524, 525, 538, 554, 555, 561]

cp's OEIS Frontend

A138046 Positive integers k such that (d(k+1) - d(k)) * (-1)^k is positive, where d(k) = the number of positive divisors of k.

Table of values

List of values

n	a(n)
1	45
2	62
3	74
4	81
5	105
6	117
7	134
8	146
9	164
10	165
11	188
12	194
13	206
14	225
15	254
16	261
17	273
18	274
19	278
20	284
21	297
22	314
23	315
24	325
25	333
26	345
27	356
28	357
29	362
30	385
31	386
32	398
33	404
34	405
35	422
36	428
37	435
38	441
39	454
40	458
41	465
42	477
43	482
44	494
45	495
46	513
47	524
48	525
49	538
50	554
51	555
52	561

n	a(n)
1	45
2	62
3	74
4	81
5	105
6	117
7	134
8	146
9	164
10	165
11	188
12	194
13	206
14	225
15	254
16	261
17	273
18	274
19	278
20	284
21	297
22	314
23	315
24	325
25	333
26	345
27	356
28	357
29	362
30	385
31	386
32	398
33	404
34	405
35	422
36	428
37	435
38	441
39	454
40	458
41	465
42	477
43	482
44	494
45	495
46	513
47	524
48	525
49	538
50	554
51	555
52	561

n	a(n)
1	45
2	62
3	74
4	81
5	105
6	117
7	134
8	146
9	164
10	165
11	188
12	194
13	206
14	225
15	254
16	261
17	273
18	274
19	278
20	284
21	297
22	314
23	315
24	325
25	333
26	345
27	356
28	357
29	362
30	385
31	386
32	398
33	404
34	405
35	422
36	428
37	435
38	441
39	454
40	458
41	465
42	477
43	482
44	494
45	495
46	513
47	524
48	525
49	538
50	554
51	555
52	561