A071929 - cp's OEIS frontend

A071929 Numbers k such that the sum of exponents of k is equal to the greatest prime factor of k; a(1)=1.

n	a(n)
1	1
2	4
3	12
4	18
5	27
6	80
7	120
8	180
9	200
10	270
11	300
12	405
13	448
14	450
15	500
16	672
17	675
18	750
19	1008
20	1120
21	1125
22	1250
23	1512
24	1568
25	1680
26	1875
27	2268
28	2352
29	2520
30	2800
31	3125
32	3402
33	3528
34	3780
35	3920
36	4200
37	5103
38	5292
39	5488
40	5670
41	5880
42	6300
43	7000
44	7938
45	8232
46	8505
47	8820

[1, 4, 12, 18, 27, 80, 120, 180, 200, 270, 300, 405, 448, 450, 500, 672, 675, 750, 1008, 1120, 1125, 1250, 1512, 1568, 1680, 1875, 2268, 2352, 2520, 2800, 3125, 3402, 3528, 3780, 3920, 4200, 5103, 5292, 5488, 5670, 5880, 6300, 7000, 7938, 8232, 8505, 8820]

cp's OEIS Frontend

A071929 Numbers k such that the sum of exponents of k is equal to the greatest prime factor of k; a(1)=1.

Table of values

List of values