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.

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A144766 Terms in A144719 that are themselves decimal palindromes.

Original entry on oeis.org

121, 10001, 10201, 36763, 1226221, 7673767, 12467976421, 1030507050301, 1120237320211, 1225559555221, 1234469644321, 1334459544331, 100330272033001, 100827848728001, 101222252222101, 103023070320301, 121363494363121, 134312696213431, 10022212521222001
Offset: 1

Views

Author

Reikku Kulon, Sep 20 2008

Keywords

Comments

Presumed infinite, but it is difficult to find more terms.
The earlier claim that this sequence is a subsequence of A046450 was incorrect, as the counterexample of 7673767 =97*79111 shows. The reason is that A046450 checks only concatenations in the natural order of the prime factors, but this sequence here allows for both orders, 97//79111 as well as 79111//97, to be palindromic. - R. J. Mathar, Jan 22 2009
3*10^14 < a(19) <= 10022212521222001. - Donovan Johnson, Dec 08 2010

Examples

			10001 = 73 * 137; 73137 is a palindrome.

Links

Crossrefs

Cf. A002113, A046450, A144719.

Formula

Subsequence of (A144719 INTERSECT A046328). - R. J. Mathar, Jan 22 2009

Extensions

a(7)-a(18) from Donovan Johnson, Dec 08 2010
a(19) from Giovanni Resta, Aug 31 2018
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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