A268177 - cp's OEIS frontend

A268177 Numbers m such that Sum_{i=1..q} 1/lambda(d(i)) is an integer, where d(i) are the q divisors of m and lambda is the Carmichael lambda function (A002322).

n	a(n)
1	1
2	2
3	6
4	8
5	12
6	15
7	24
8	28
9	30
10	40
11	70
12	84
13	112
14	120
15	140
16	210
17	240
18	252
19	280
20	315
21	336
22	351
23	357
24	360
25	420
26	550
27	630
28	684
29	702
30	714
31	836
32	840
33	884
34	912
35	952
36	988
37	1092
38	1100
39	1120
40	1140
41	1364
42	1386
43	1650
44	1710
45	1820
46	2002
47	2040
48	2088
49	2090
50	2200
51	2394
52	2484

[1, 2, 6, 8, 12, 15, 24, 28, 30, 40, 70, 84, 112, 120, 140, 210, 240, 252, 280, 315, 336, 351, 357, 360, 420, 550, 630, 684, 702, 714, 836, 840, 884, 912, 952, 988, 1092, 1100, 1120, 1140, 1364, 1386, 1650, 1710, 1820, 2002, 2040, 2088, 2090, 2200, 2394, 2484]

cp's OEIS Frontend

A268177 Numbers m such that Sum_{i=1..q} 1/lambda(d(i)) is an integer, where d(i) are the q divisors of m and lambda is the Carmichael lambda function (A002322).

Table of values

List of values