A189554 - cp's OEIS frontend

A189554 Composite numbers n such that x' = n has no integer solution, where x' is the arithmetic derivative (A003415) of x.

n	a(n)
1	35
2	57
3	65
4	93
5	117
6	125
7	145
8	177
9	189
10	205
11	207
12	209
13	217
14	219
15	237
16	245
17	261
18	289
19	303
20	305
21	323
22	325
23	345
24	377
25	387
26	393
27	413
28	415
29	427
30	429
31	453
32	473
33	477
34	485
35	497
36	513
37	515
38	517
39	529
40	531
41	533
42	537
43	553
44	561
45	597
46	605
47	625
48	629
49	639
50	657
51	665
52	681

[35, 57, 65, 93, 117, 125, 145, 177, 189, 205, 207, 209, 217, 219, 237, 245, 261, 289, 303, 305, 323, 325, 345, 377, 387, 393, 413, 415, 427, 429, 453, 473, 477, 485, 497, 513, 515, 517, 529, 531, 533, 537, 553, 561, 597, 605, 625, 629, 639, 657, 665, 681]

cp's OEIS Frontend

A189554 Composite numbers n such that x' = n has no integer solution, where x' is the arithmetic derivative (A003415) of x.

Table of values

List of values

n	a(n)
1	35
2	57
3	65
4	93
5	117
6	125
7	145
8	177
9	189
10	205
11	207
12	209
13	217
14	219
15	237
16	245
17	261
18	289
19	303
20	305
21	323
22	325
23	345
24	377
25	387
26	393
27	413
28	415
29	427
30	429
31	453
32	473
33	477
34	485
35	497
36	513
37	515
38	517
39	529
40	531
41	533
42	537
43	553
44	561
45	597
46	605
47	625
48	629
49	639
50	657
51	665
52	681

n	a(n)
1	35
2	57
3	65
4	93
5	117
6	125
7	145
8	177
9	189
10	205
11	207
12	209
13	217
14	219
15	237
16	245
17	261
18	289
19	303
20	305
21	323
22	325
23	345
24	377
25	387
26	393
27	413
28	415
29	427
30	429
31	453
32	473
33	477
34	485
35	497
36	513
37	515
38	517
39	529
40	531
41	533
42	537
43	553
44	561
45	597
46	605
47	625
48	629
49	639
50	657
51	665
52	681

n	a(n)
1	35
2	57
3	65
4	93
5	117
6	125
7	145
8	177
9	189
10	205
11	207
12	209
13	217
14	219
15	237
16	245
17	261
18	289
19	303
20	305
21	323
22	325
23	345
24	377
25	387
26	393
27	413
28	415
29	427
30	429
31	453
32	473
33	477
34	485
35	497
36	513
37	515
38	517
39	529
40	531
41	533
42	537
43	553
44	561
45	597
46	605
47	625
48	629
49	639
50	657
51	665
52	681