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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.

A218343 a(n) is the largest n-digit palindromic integer surrounded by twin primes, if one exists, or 0 otherwise.

Table of values

n a(n)
1 6
2 0
3 858
4 2112
5 89898
6 276672
7 8916198
8 89522598
9 898373898
10 8998558998
11 89984248998
12 899931139998
13 8999867689998
14 89999400499998
15 899998808899998
16 8999950220599998
17 89999961316999998
18 899999985589999998
19 8999999741479999998
20 89999993611639999998

List of values

[6, 0, 858, 2112, 89898, 276672, 8916198, 89522598, 898373898, 8998558998, 89984248998, 899931139998, 8999867689998, 89999400499998, 899998808899998, 8999950220599998, 89999961316999998, 899999985589999998, 8999999741479999998, 89999993611639999998]

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

Content is available under The OEIS End-User License Agreement.