A189555 - cp's OEIS frontend

A189555 Numbers n such that x' = n has two solutions, where x' is the arithmetic derivative (A003415) of x.

n	a(n)
1	10
2	12
3	14
4	18
5	20
6	21
7	28
8	31
9	38
10	39
11	45
12	55
13	61
14	71
15	81
16	87
17	101
18	103
19	111
20	119
21	123
22	129
23	131
24	147
25	183
26	185
27	199
28	211
29	213
30	215
31	241
32	243
33	255
34	269
35	291
36	297
37	299
38	327
39	339
40	343
41	351
42	355
43	359
44	361
45	363
46	381
47	395
48	399
49	401
50	411
51	421
52	433
53	439
54	471
55	493

[10, 12, 14, 18, 20, 21, 28, 31, 38, 39, 45, 55, 61, 71, 81, 87, 101, 103, 111, 119, 123, 129, 131, 147, 183, 185, 199, 211, 213, 215, 241, 243, 255, 269, 291, 297, 299, 327, 339, 343, 351, 355, 359, 361, 363, 381, 395, 399, 401, 411, 421, 433, 439, 471, 493]

cp's OEIS Frontend

A189555 Numbers n such that x' = n has two solutions, where x' is the arithmetic derivative (A003415) of x.

Table of values

List of values

n	a(n)
1	10
2	12
3	14
4	18
5	20
6	21
7	28
8	31
9	38
10	39
11	45
12	55
13	61
14	71
15	81
16	87
17	101
18	103
19	111
20	119
21	123
22	129
23	131
24	147
25	183
26	185
27	199
28	211
29	213
30	215
31	241
32	243
33	255
34	269
35	291
36	297
37	299
38	327
39	339
40	343
41	351
42	355
43	359
44	361
45	363
46	381
47	395
48	399
49	401
50	411
51	421
52	433
53	439
54	471
55	493

n	a(n)
1	10
2	12
3	14
4	18
5	20
6	21
7	28
8	31
9	38
10	39
11	45
12	55
13	61
14	71
15	81
16	87
17	101
18	103
19	111
20	119
21	123
22	129
23	131
24	147
25	183
26	185
27	199
28	211
29	213
30	215
31	241
32	243
33	255
34	269
35	291
36	297
37	299
38	327
39	339
40	343
41	351
42	355
43	359
44	361
45	363
46	381
47	395
48	399
49	401
50	411
51	421
52	433
53	439
54	471
55	493

n	a(n)
1	10
2	12
3	14
4	18
5	20
6	21
7	28
8	31
9	38
10	39
11	45
12	55
13	61
14	71
15	81
16	87
17	101
18	103
19	111
20	119
21	123
22	129
23	131
24	147
25	183
26	185
27	199
28	211
29	213
30	215
31	241
32	243
33	255
34	269
35	291
36	297
37	299
38	327
39	339
40	343
41	351
42	355
43	359
44	361
45	363
46	381
47	395
48	399
49	401
50	411
51	421
52	433
53	439
54	471
55	493