

A164898


First differences of numbers having only odd digits in their decimal representation.


3



2, 2, 2, 2, 2, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12, 2, 2, 2, 2, 112, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12, 2, 2, 2, 2, 112, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12, 2, 2, 2, 2, 12
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OFFSET

1,1


COMMENTS

all terms are of the form (10^k + 8)/9, see A047855;
a(n) > 2 iff A014261(n) mod 10 = 9.


LINKS



MAPLE

R[1]:= [1, 3, 5, 7, 9]:
for d from 2 to 3 do
R[d]:= map(t > seq(10*t+i, i=[1, 3, 5, 7, 9]), R[d1])
od:
B:= map(op, [seq(R[d], d=1..3)]):


MATHEMATICA

Differences[Select[Range[1000], Count[IntegerDigits[#], _?EvenQ]==0&]] (* Harvey P. Dale, Jan 03 2019 *)


CROSSREFS



KEYWORD

nonn,base


AUTHOR



STATUS

approved



