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A051804 Numbers with nonzero multiplicative digital root 2. 2
2, 12, 20, 21, 26, 34, 37, 43, 45, 54, 59, 62, 69, 73, 95, 96, 102, 112, 120, 121, 126, 134, 137, 143, 145, 154, 159, 162, 169, 173, 195, 196, 200, 201, 206, 210, 211, 216, 223, 225, 232, 239, 252, 260, 261, 268, 278, 279, 286 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..49.

Index entries for 10-automatic sequences.

FORMULA

A051802^-1(2)

MATHEMATICA

nzd[n_]:=Select[IntegerDigits[n], #!=0&]; dr2Q[m_]:=NestWhile[Times@@ nzd[#]&, m, #>9&]==2; Select[Range[300], dr2Q] (* Harvey P. Dale, Jul 01 2015 *)

CROSSREFS

Part of histogram of A051802.

Sequence in context: A011532 A277964 A043497 * A121022 A277589 A069164

Adjacent sequences:  A051801 A051802 A051803 * A051805 A051806 A051807

KEYWORD

nonn,easy,base

AUTHOR

Dan Hoey, Dec 09 1999

STATUS

approved

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Last modified November 12 22:10 EST 2019. Contains 329079 sequences. (Running on oeis4.)