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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A238257 Numbers n such that n and 2n+1 use only odd decimal digits.

Table of values

n a(n)
1 1
2 3
3 5
4 7
5 9
6 15
7 17
8 19
9 35
10 37
11 39
12 55
13 57
14 59
15 75
16 77
17 79
18 95
19 97
20 99
21 155
22 157
23 159
24 175
25 177
26 179
27 195
28 197
29 199
30 355
31 357
32 359
33 375
34 377
35 379
36 395
37 397
38 399
39 555
40 557
41 559
42 575
43 577
44 579
45 595
46 597
47 599
48 755
49 757
50 759
51 775
52 777
53 779
54 795
55 797
56 799
57 955
58 957
59 959
60 975
61 977
62 979
63 995
64 997
65 999
66 1555
67 1557
68 1559
69 1575
70 1577
71 1579

List of values

[1, 3, 5, 7, 9, 15, 17, 19, 35, 37, 39, 55, 57, 59, 75, 77, 79, 95, 97, 99, 155, 157, 159, 175, 177, 179, 195, 197, 199, 355, 357, 359, 375, 377, 379, 395, 397, 399, 555, 557, 559, 575, 577, 579, 595, 597, 599, 755, 757, 759, 775, 777, 779, 795, 797, 799, 955, 957, 959, 975, 977, 979, 995, 997, 999, 1555, 1557, 1559, 1575, 1577, 1579]