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A027675
When squared gives number composed of digits {1,4,9}.
4
1, 2, 3, 7, 12, 21, 38, 107, 212, 31488, 70107, 387288, 95610729, 446653271, 3148717107, 21081079479, 648070211589107021
OFFSET
1,2
COMMENTS
If a number has a least significant digit of 0, 4, 5 or 6, it can't be in this sequence. - Alonso del Arte, Jun 11 2016
EXAMPLE
Since 107^2 = 11449, 107 is in the sequence.
As 108^2 = 11664 has two 6's, 108 is not in the sequence.
MATHEMATICA
Select[Range[100], Complement[IntegerDigits[#^2], {1, 4, 9}] == {} &] (* Alonso del Arte, Jun 11 2016 *)
CROSSREFS
Cf. A006716.
Sequence in context: A222196 A184696 A298341 * A298353 A054176 A289977
KEYWORD
nonn,base,more
STATUS
approved

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