A373479 - cp's OEIS frontend

A373479 Numbers k such that A001414(k) and A003415(k) are both multiples of 3, but A083345(k) is not, where A001414 is the sum of prime factors with repetition, A003415 is the arithmetic derivative, and A083345(n) = A003415(n)/gcd(n,A003415(n)).

n	a(n)
1	9
2	27
3	72
4	81
5	126
6	180
7	216
8	234
9	243
10	315
11	342
12	378
13	396
14	450
15	540
16	558
17	576
18	585
19	612
20	648
21	666
22	693
23	702
24	729
25	774
26	828
27	855
28	945
29	990
30	1008
31	1026
32	1044
33	1071
34	1098
35	1125
36	1134
37	1188
38	1206
39	1287
40	1314
41	1350
42	1395
43	1422
44	1440
45	1449
46	1476
47	1530
48	1620
49	1665
50	1674
51	1692
52	1728
53	1746
54	1755
55	1764
56	1827
57	1836
58	1854

[9, 27, 72, 81, 126, 180, 216, 234, 243, 315, 342, 378, 396, 450, 540, 558, 576, 585, 612, 648, 666, 693, 702, 729, 774, 828, 855, 945, 990, 1008, 1026, 1044, 1071, 1098, 1125, 1134, 1188, 1206, 1287, 1314, 1350, 1395, 1422, 1440, 1449, 1476, 1530, 1620, 1665, 1674, 1692, 1728, 1746, 1755, 1764, 1827, 1836, 1854]

cp's OEIS Frontend

A373479 Numbers k such that A001414(k) and A003415(k) are both multiples of 3, but A083345(k) is not, where A001414 is the sum of prime factors with repetition, A003415 is the arithmetic derivative, and A083345(n) = A003415(n)/gcd(n,A003415(n)).

Table of values

List of values