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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.

A260852 Primes in A260851: numbers whose base n expansion is equal to the concatenation of the base n expansions of (1, 2, 3, ..., n-1, n, n-1, ..., 3, 2, 1).

Table of values

n a(n)
1 13
2 439
3 27961
4 522134761
5 21107054541321649
6 12345678910987654321
7 24197857203266734883076090685781525281

List of values

[13, 439, 27961, 522134761, 21107054541321649, 12345678910987654321, 24197857203266734883076090685781525281]

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

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