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.

A350153 Prime numbers created by concatenating all numbers 1 through k for some k > 1, then continuing to concatenate all numbers from k-1 towards 1. Primes are added to the sequence as they are found as k increases.

Table of values

n a(n)
1 12343
2 1234543
3 12345678910987
4 12345678910987654321
5 12345678910111213141516171819202122212019181716151413
6 12345678910111213141516171819202122232425262728293029

List of values

[12343, 1234543, 12345678910987, 12345678910987654321, 12345678910111213141516171819202122212019181716151413, 12345678910111213141516171819202122232425262728293029]

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

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