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.

A215256 Longest palindromic factor of (n base 2); in case of tie choose largest; if it begins with 0 complement it.

Original entry on oeis.org

1, 1, 1, 11, 11, 101, 11, 111, 111, 1001, 101, 101, 11, 101, 111, 1111, 1111, 10001, 1001, 1001, 101, 10101, 1001, 111, 111, 1001, 101, 11011, 111, 111, 1111, 11111, 11111, 100001, 10001, 10001, 11011, 1001, 1001, 1001, 101, 1001, 10101, 10101, 1001, 101101
Offset: 0

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Author

N. J. A. Sloane, Aug 15 2012

Keywords

Comments

The "if it begins with 0 complement it" clause is required because nonzero terms in the OEIS may not begin with 0.

Examples

			n=10 = 1010, longest palindromic factor is 101.
n=12 = 1100, there are two palindromic factors of length 2, namely 11 and 00, and we choose the larger, 11.
n=24 = 11000, longest palindromic factor is 000, complementing gives 111.
		

Crossrefs

Extensions

More terms from Lars Blomberg, Jun 29 2014