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A199986
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Numbers with digital product = 2.
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2
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2, 12, 21, 112, 121, 211, 1112, 1121, 1211, 2111, 11112, 11121, 11211, 12111, 21111, 111112, 111121, 111211, 112111, 121111, 211111, 1111112, 1111121, 1111211, 1112111, 1121111, 1211111, 2111111, 11111112, 11111121, 11111211, 11112111, 11121111, 11211111
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listen;
history;
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OFFSET
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1,1
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COMMENTS
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Subsequence of A034049.
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LINKS
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Robert Israel, Table of n, a(n) for n = 1..10000
S. Giraudo, Combinatorial operads from monoids, arXiv preprint arXiv:1306.6938, 2013. See Sect. 3.2.1.
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MAPLE
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f:= proc(d) local b, i;
b:= (10^d-1)/9;
seq(b+10^i, i=0..d-1);
end proc:
seq(f(d), d=1..9); # Robert Israel, Jan 13 2021
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PROG
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(PARI) one(n)=if(n, 10^n\9, "")
for(n=0, 9, for(m=0, n, print1(one(n-m)2one(m)", "))) \\ Charles R Greathouse IV, Nov 13 2011
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CROSSREFS
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Sequence in context: A053896 A155890 A213969 * A336528 A077410 A211029
Adjacent sequences: A199983 A199984 A199985 * A199987 A199988 A199989
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KEYWORD
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nonn,easy,base,changed
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AUTHOR
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Jaroslav Krizek, Nov 13 2011
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STATUS
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approved
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