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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.

A340539 a(n) is the least prime that is the concatenation of two n-digit primes, and such that the concatenation of the same primes in the other order is also prime or 0 if no such prime exists.

Table of values

n a(n)
1 37
2 1123
3 101107
4 10091789
5 1000710709
6 100003100363
7 10000031000303
8 1000001910002521
9 100000007100010321
10 10000000071000000349
11 1000000001910000000799
12 100000000003100000009939
13 10000000000391000000012387
14 1000000000003710000000034573
15 100000000000031100000000014113

List of values

[37, 1123, 101107, 10091789, 1000710709, 100003100363, 10000031000303, 1000001910002521, 100000007100010321, 10000000071000000349, 1000000001910000000799, 100000000003100000009939, 10000000000391000000012387, 1000000000003710000000034573, 100000000000031100000000014113]

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

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