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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.

A372207 a(n) is the smallest prime number that is obtained by concatenating 2 consecutive n-digit integers.

Table of values

n a(n)
1 23
2 1213
3 102101
4 10021001
5 1000810007
6 100010100011
7 10000241000023
8 1000004210000041
9 100000002100000003
10 10000000081000000009
11 1000000000810000000007
12 100000000002100000000001
13 10000000000021000000000001
14 1000000000001010000000000011
15 100000000000002100000000000003

List of values

[23, 1213, 102101, 10021001, 1000810007, 100010100011, 10000241000023, 1000004210000041, 100000002100000003, 10000000081000000009, 1000000000810000000007, 100000000002100000000001, 10000000000021000000000001, 1000000000001010000000000011, 100000000000002100000000000003]

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

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