A253288 - cp's OEIS frontend

A253288 Each term a(n) satisfies four properties: 1, divisible by all prime factors of n; 2, divisible by only the prime factors of n; 3, not equal to any of the terms a(1), a(2), ... a(n-1); 4, smallest number satisfying 1-3 if A005361(n) is even, or second smallest number satisfying 1-3 if A005361(n) is odd.

n	a(n)
1	1
2	4
3	9
4	2
5	25
6	12
7	49
8	16
9	3
10	20
11	121
12	6
13	169
14	28
15	45
16	8
17	289
18	18
19	361
20	10
21	63
22	44
23	529
24	36
25	5
26	52
27	81
28	14
29	841
30	60
31	961
32	64
33	99
34	68
35	175
36	24
37	1369
38	76
39	117
40	50
41	1681
42	84
43	1849
44	22
45	15
46	92
47	2209
48	48
49	7
50	40
51	153
52	26
53	2809
54	72
55	275
56	98
57	171
58	116
59	3481
60	30
61	3721
62	124
63	21
64	32

[1, 4, 9, 2, 25, 12, 49, 16, 3, 20, 121, 6, 169, 28, 45, 8, 289, 18, 361, 10, 63, 44, 529, 36, 5, 52, 81, 14, 841, 60, 961, 64, 99, 68, 175, 24, 1369, 76, 117, 50, 1681, 84, 1849, 22, 15, 92, 2209, 48, 7, 40, 153, 26, 2809, 72, 275, 98, 171, 116, 3481, 30, 3721, 124, 21, 32]

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