cp's OEIS Frontend

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.

A268145 Twin prime pairs concatenated to their average in decimal representation (with the lesser twin prepended and the greater twin appended).

Table of values

n a(n)
1 345
2 567
3 111213
4 171819
5 293031
6 414243
7 596061
8 717273
9 101102103
10 107108109
11 137138139
12 149150151
13 179180181
14 191192193
15 197198199
16 227228229
17 239240241
18 269270271
19 281282283
20 311312313
21 347348349
22 419420421
23 431432433
24 461462463
25 521522523
26 569570571
27 599600601

List of values

[345, 567, 111213, 171819, 293031, 414243, 596061, 717273, 101102103, 107108109, 137138139, 149150151, 179180181, 191192193, 197198199, 227228229, 239240241, 269270271, 281282283, 311312313, 347348349, 419420421, 431432433, 461462463, 521522523, 569570571, 599600601]

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

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