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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A043268 Sum of digits of n-th base 9 palindrome.

Original entry on oeis.org

0, 1, 2, 3, 4, 5, 6, 7, 8, 2, 4, 6, 8, 10, 12, 14, 16, 2, 3, 4, 5, 6, 7, 8, 9, 10, 4, 5, 6, 7, 8, 9, 10, 11, 12, 6, 7, 8, 9, 10, 11, 12, 13, 14, 8, 9, 10, 11, 12, 13, 14, 15, 16, 10, 11, 12, 13, 14, 15, 16, 17, 18, 12, 13, 14, 15, 16, 17, 18, 19, 20, 14
Offset: 1

Views

Author

Clark Kimberling

Keywords

Crossrefs

A029955 (base 9 palindromes)

A319595 Numbers in base 10 that are palindromic in bases 3, 7, and 9.

Original entry on oeis.org

0, 1, 2, 4, 8, 40, 100, 164, 328, 400, 8200, 14762, 532900
Offset: 1

Views

Author

Jeremias M. Gomes, Sep 23 2018

Keywords

Comments

Intersection of A014190, A029954, and A029955.
No other terms < 10^17. It is likely that there are no more terms. - Chai Wah Wu, Mar 20 2020

Examples

			400 = 112211_3 = 1111_7 = 484_9.

Crossrefs

Cf. A014190 (base 3), A029954 (base 7), and A029955 (base 9).

Programs

  • Sage
    [n for n in (0..100000) if Word(n.digits(3)).is_palindrome() and Word(n.digits(7)).is_palindrome() and Word(n.digits(9)).is_palindrome()]
Previous Showing 31-32 of 32 results.

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

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