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A201024 Composite numbers whose multiplicative digital root is 9. 0
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

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

LINKS

Table of n, a(n) for n=1..40.

EXAMPLE

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

MATHEMATICA

Select[Range[320000], !PrimeQ[#]&&Times@@IntegerDigits[#]==9&] (* Harvey P. Dale, Aug 27 2012 *)

CROSSREFS

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

Sequence in context: A020228 A005939 A020326 * A228170 A112888 A048479

Adjacent sequences:  A201021 A201022 A201023 * A201025 A201026 A201027

KEYWORD

nonn,base

AUTHOR

Jaroslav Krizek, Nov 25 2011

STATUS

approved

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Last modified January 20 16:46 EST 2019. Contains 319335 sequences. (Running on oeis4.)