OFFSET
1,2
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
MATHEMATICA
bn1Q[n_]:=AnyTrue[Union/@(Select[{DigitCount[#, 2, 1], DigitCount[n/#, 2, 1]}&/@ Divisors[n], #[[1]]==#[[2]]&]), #=={DigitCount[n, 2, 1]}&]; Select[Range[ 1600], bn1Q] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Aug 03 2020 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Jan 21 2003
STATUS
approved