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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.

A381869 Smallest starting prime for which the sum of 2*n consecutive primes is 0 modulo 10, or -1 if no such prime exists.

Table of values

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

List of values

[13, 11, 7, 7, 13, 17, 7, 17, 37, 3, 7, 41, 7, 7, 11, 11, 11, 11, 11, 13, 11, 13, 11, 7, 7, 17, 7, 43, 41, 3, 3, 13, 11, 7, 13, 19, 7, 11, 11, 29, 7, 43, 3, 7, 11, 13, 23, 29, 3, 7, 7, 11, 11, 11, 19, 13, 5, 5, 13, 37, 17, 3, 3, 7, 17, 17, 3, 11, 19, 13, 3, 7, 23]

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