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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A201024 Composite numbers whose multiplicative digital root is 9.

Original entry on oeis.org

9, 33, 91, 119, 133, 1119, 1133, 1191, 1313, 1331, 1911, 3113, 3131, 3311, 9111, 11133, 11191, 11313, 11331, 11911, 13113, 13131, 13311, 19111, 31113, 31131, 31311, 33111, 91111, 111133, 111313, 111331, 111911, 113113, 113311, 119111, 131131, 133111, 191111, 311113
Offset: 1

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Author

Jaroslav Krizek, Nov 25 2011

Keywords

Comments

Also composite numbers whose product of digits is 9. Complement of A107695 with respect to A034056.

Examples

			Number 133 is in sequence because 1*3*3=9.

Crossrefs

Cf. A107695 (primes whose multiplicative digital root is 9), A034056 (numbers whose multiplicative digital root is 9).

Programs

  • Mathematica
    Select[Range[320000],!PrimeQ[#]&&Times@@IntegerDigits[#]==9&] (* Harvey P. Dale, Aug 27 2012 *)
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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