A290169 - cp's OEIS frontend

A290169 a(n) = least k such that both the sum of the smallest n divisors of k and the sum of its greatest n divisors are prime numbers.

n	a(n)
2	2
3	4
4	30
5	16
6	140
7	64
8	264
9	144
10	336
11	525
12	144
13	800
14	1200
15	576
16	1600
17	2016
18	1440
19	1296
20	2160
21	2304
22	7980
23	6440
24	3360
25	8360
26	4080
27	3960
28	2772
29	16100
30	9108
31	10608
32	7392
33	12320
34	14688
35	37240
36	21780
37	18200
38	45760
39	20160
40	9240
41	24624
42	14364
43	8400
44	22176
45	23760

[2, 4, 30, 16, 140, 64, 264, 144, 336, 525, 144, 800, 1200, 576, 1600, 2016, 1440, 1296, 2160, 2304, 7980, 6440, 3360, 8360, 4080, 3960, 2772, 16100, 9108, 10608, 7392, 12320, 14688, 37240, 21780, 18200, 45760, 20160, 9240, 24624, 14364, 8400, 22176, 23760]

cp's OEIS Frontend

A290169 a(n) = least k such that both the sum of the smallest n divisors of k and the sum of its greatest n divisors are prime numbers.

Table of values

List of values