A257313 - cp's OEIS frontend

A257313 a(1) = 10; a(2) = 11; for n > 2, a(n) is the smallest number of the form prime + 8 not already used which shares a factor with a(n-1).

n	a(n)
1	10
2	11
3	55
4	15
5	21
6	27
7	39
8	13
9	91
10	49
11	105
12	25
13	45
14	51
15	69
16	75
17	81
18	87
19	111
20	37
21	259
22	147
23	117
24	135
25	115
26	145
27	165
28	121
29	187
30	231
31	159
32	171
33	19
34	247
35	285
36	175
37	189
38	201
39	67
40	469
41	301
42	315
43	205
44	235
45	265
46	325
47	345
48	207
49	219
50	237
51	79
52	1027
53	429
54	249
55	279
56	31

[10, 11, 55, 15, 21, 27, 39, 13, 91, 49, 105, 25, 45, 51, 69, 75, 81, 87, 111, 37, 259, 147, 117, 135, 115, 145, 165, 121, 187, 231, 159, 171, 19, 247, 285, 175, 189, 201, 67, 469, 301, 315, 205, 235, 265, 325, 345, 207, 219, 237, 79, 1027, 429, 249, 279, 31]

cp's OEIS Frontend

A257313 a(1) = 10; a(2) = 11; for n > 2, a(n) is the smallest number of the form prime + 8 not already used which shares a factor with a(n-1).

Table of values

List of values