A131847 - cp's OEIS frontend

A131847 Positive integers n which each have at least one "isolated isolated divisor". An isolated isolated divisor is an isolated divisor that is not adjacent to any other isolated divisors in the list of all positive divisors of n. A divisor, k, of n is isolated if neither (k-1) nor (k+1) divides n.

n	a(n)
1	1
2	4
3	6
4	56
5	72
6	110
7	112
8	132
9	144
10	156
11	182
12	210
13	216
14	224
15	288
16	380
17	392
18	432
19	440
20	448
21	506
22	550
23	576
24	616
25	648
26	720
27	728
28	780
29	784
30	792
31	864
32	880
33	896
34	924
35	936
36	952
37	1050
38	1064
39	1152
40	1200
41	1210
42	1224
43	1232
44	1260
45	1274
46	1288
47	1296
48	1320
49	1368
50	1404

[1, 4, 6, 56, 72, 110, 112, 132, 144, 156, 182, 210, 216, 224, 288, 380, 392, 432, 440, 448, 506, 550, 576, 616, 648, 720, 728, 780, 784, 792, 864, 880, 896, 924, 936, 952, 1050, 1064, 1152, 1200, 1210, 1224, 1232, 1260, 1274, 1288, 1296, 1320, 1368, 1404]

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