A190273 - cp's OEIS frontend

A190273 Numbers n such that n' = m+1, with n and m semiprimes and gcd(m,n)>1, where n' is the arithmetic derivative of n.

n	a(n)
1	6
2	10
3	21
4	26
5	39
6	55
7	57
8	74
9	93
10	111
11	122
12	146
13	155
14	201
15	203
16	253
17	301
18	305
19	314
20	327
21	381
22	386
23	417
24	471
25	497
26	543
27	554
28	597
29	626
30	633
31	689
32	737
33	755
34	791
35	794
36	842
37	889
38	905
39	914
40	921
41	1011
42	1027
43	1055
44	1081
45	1082
46	1137
47	1226
48	1227
49	1322
50	1346
51	1379
52	1461
53	1466
54	1477
55	1497
56	1514
57	1623
58	1655
59	1703
60	1711
61	1713
62	1731
63	1751
64	1754
65	1893
66	1967
67	1994

[6, 10, 21, 26, 39, 55, 57, 74, 93, 111, 122, 146, 155, 201, 203, 253, 301, 305, 314, 327, 381, 386, 417, 471, 497, 543, 554, 597, 626, 633, 689, 737, 755, 791, 794, 842, 889, 905, 914, 921, 1011, 1027, 1055, 1081, 1082, 1137, 1226, 1227, 1322, 1346, 1379, 1461, 1466, 1477, 1497, 1514, 1623, 1655, 1703, 1711, 1713, 1731, 1751, 1754, 1893, 1967, 1994]

cp's OEIS Frontend

A190273 Numbers n such that n' = m+1, with n and m semiprimes and gcd(m,n)>1, where n' is the arithmetic derivative of n.

Table of values

List of values