A111273 - cp's OEIS frontend

A111273 a(n) is the smallest divisor of triangular number T(n) := n(n+1)/2 not already in the sequence.

n	a(n)
1	1
2	3
3	2
4	5
5	15
6	7
7	4
8	6
9	9
10	11
11	22
12	13
13	91
14	21
15	8
16	17
17	51
18	19
19	10
20	14
21	33
22	23
23	12
24	20
25	25
26	27
27	18
28	29
29	87
30	31
31	16
32	24
33	187
34	35
35	30
36	37
37	703
38	39
39	26
40	41
41	123
42	43
43	86
44	45
45	69
46	47
47	94
48	28
49	49
50	75
51	34
52	53
53	159
54	55
55	44
56	38
57	57
58	59
59	118
60	61
61	1891
62	63
63	32
64	40
65	65
66	67
67	134
68	46
69	105

[1, 3, 2, 5, 15, 7, 4, 6, 9, 11, 22, 13, 91, 21, 8, 17, 51, 19, 10, 14, 33, 23, 12, 20, 25, 27, 18, 29, 87, 31, 16, 24, 187, 35, 30, 37, 703, 39, 26, 41, 123, 43, 86, 45, 69, 47, 94, 28, 49, 75, 34, 53, 159, 55, 44, 38, 57, 59, 118, 61, 1891, 63, 32, 40, 65, 67, 134, 46, 105]

cp's OEIS Frontend

A111273 a(n) is the smallest divisor of triangular number T(n) := n(n+1)/2 not already in the sequence.

Table of values

List of values