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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.

A173980 a(n) is the smallest term m in A173978 for which A020639(2m-3) = prime(n), n > 1.

Table of values

n a(n)
2 6
3 19
4 40
5 106
6 112
7 265
8 220
9 427
10 625
11 730
12 871
13 1252
14 1141
15 1717
16 2095
17 2332
18 2716
19 2380
20 3445
21 6097
22 4465
23 4027
24 6187
25 6646
26 6415
27 7675
28 6796
29 7141
30 15991
31 8701
32 9106
33 12400
34 12025
35 11251
36 12610
37 14995
38 14101
39 16117
40 16696
41 16201
42 21631
43 19006
44 22486
45 21967

List of values

[6, 19, 40, 106, 112, 265, 220, 427, 625, 730, 871, 1252, 1141, 1717, 2095, 2332, 2716, 2380, 3445, 6097, 4465, 4027, 6187, 6646, 6415, 7675, 6796, 7141, 15991, 8701, 9106, 12400, 12025, 11251, 12610, 14995, 14101, 16117, 16696, 16201, 21631, 19006, 22486, 21967]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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