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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.

A139259 Triangle read by rows: row n lists the digits of A139258(n), the palindromic number formed from the reflected decimal expansion of Euler's constant (or Euler-Mascheroni constant) gamma.

Table of values

n a(n)
1 5
2 5
3 5
4 5
5 7
6 5
7 5
8 7
9 7
10 5
11 5
12 7
13 7
14 7
15 5
16 5
17 7
18 7
19 7
20 7
21 5
22 5
23 7
24 7
25 2
26 7
27 7
28 5
29 5
30 7
31 7
32 2
33 2
34 7
35 7
36 5
37 5
38 7
39 7
40 2
41 1
42 2
43 7
44 7
45 5
46 5
47 7
48 7
49 2
50 1
51 1
52 2
53 7
54 7
55 5
56 5
57 7
58 7
59 2
60 1
61 5
62 1
63 2
64 7
65 7
66 5
67 5
68 7
69 7
70 2
71 1
72 5
73 5
74 1
75 2
76 7
77 7
78 5

List of values

[5, 5, 5, 5, 7, 5, 5, 7, 7, 5, 5, 7, 7, 7, 5, 5, 7, 7, 7, 7, 5, 5, 7, 7, 2, 7, 7, 5, 5, 7, 7, 2, 2, 7, 7, 5, 5, 7, 7, 2, 1, 2, 7, 7, 5, 5, 7, 7, 2, 1, 1, 2, 7, 7, 5, 5, 7, 7, 2, 1, 5, 1, 2, 7, 7, 5, 5, 7, 7, 2, 1, 5, 5, 1, 2, 7, 7, 5]

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