|
|
A137027
|
|
Numbers k such that k and k^2 use only the digits 1, 3, 4, 6 and 9.
|
|
1
|
|
|
1, 3, 4, 6, 13, 14, 19, 31, 44, 63, 119, 369, 643, 1146, 1414, 1914, 3114, 3364, 4119, 6414, 6646, 11914, 11963, 14119, 31131, 31614, 34196, 36694, 44313, 64313, 64414, 141313, 191414, 311343, 316143, 336696, 363196, 366946, 411636, 411694, 641414, 969119, 1196646, 1414194, 1913469, 3334114, 3363646, 3649196, 3666969, 3693196, 4434114
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
COMMENTS
|
Generated with DrScheme.
|
|
LINKS
|
|
|
EXAMPLE
|
641431341949136^2 = 411434166434669436443611146496.
|
|
MATHEMATICA
|
sdQ[n_]:=Module[{idn2=Union[IntegerDigits[n^2]]}, And@@Table[ MemberQ[ {1, 3, 4, 6, 9}, idn2[[i]]], {i, Length[idn2]}]]; Flatten[ Table[ Select[ FromDigits/@Tuples[{1, 3, 4, 6, 9}, d], sdQ], {d, 7}]] (* Harvey P. Dale, Jun 10 2013 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
base,nonn,changed
|
|
AUTHOR
|
Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008
|
|
STATUS
|
approved
|
|
|
|