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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.

A229129 Digital clock palindromic semiprimes.

Original entry on oeis.org

4, 6, 9, 22, 33, 55, 111, 121, 141, 202, 303, 323, 505, 515, 535, 545, 626, 707, 717, 737, 939, 949, 959, 1111, 1441
Offset: 1

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Author

Jonathan Vos Post, Sep 14 2013

Keywords

Comments

Palindromic semiprimes possible on a 24-hour digital clock, with no seconds. This is similar to A229107 as semiprimes (A001358) are to prime A000040, except this sequence has no seconds.

Crossrefs

Cf. A001358, A002113, A229107.

Formula

Digital clock semiprimes (A129336) INTERSECTION Palindromes in base 10 (A002113).

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

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