OFFSET
1,1
COMMENTS
Concatenations with x=0 or y=0 or that allow y with leading zeros are not taken into account.
LINKS
Robert Israel, Table of n, a(n) for n = 1..250
EXAMPLE
43 is in the list because 4^2+3^3 = 16+27= 43 = 1x43.
159 is in the list because 15^2+9^3 = 225+729 = 954 = 6x159.
11211 is in the list because 1^2+1211^3 = 158412*11211.
10001 is not in the list although 100^2+(01)^3 = 1*10001, because it requires a leading zero in y.
MAPLE
filter:= proc(n) local j, x, y;
for j from 1 to ilog10(n) do
y:= n mod 10^j;
if y < 10^(j-1) then next fi;
x:= (n-y)/10^j;
if ((x^2+y^3)/n)::integer then return true fi
od:
false
end proc:
select(filter, [$1..10^5]); # Robert Israel, May 22 2016
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Claudio Meller, Jul 04 2009
EXTENSIONS
Missing terms inserted by R. J. Mathar, Jul 10 2009
STATUS
approved