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A081642
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Integers congruent to 0, 1 or 4 (mod 9) which are not squares.
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1
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10, 13, 18, 19, 22, 27, 28, 31, 37, 40, 45, 46, 54, 55, 58, 63, 67, 72, 73, 76, 82, 85, 90, 91, 94, 99, 103, 108, 109, 112, 117, 118, 126, 127, 130, 135, 136, 139, 145, 148, 153, 154, 157, 162, 163, 166, 171, 172, 175, 180, 181, 184, 189, 190, 193, 198, 199, 202
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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REFERENCES
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Mark A. Herkommer, Number Theory, A Programmer's Guide, McGraw-Hill, New York, 1999, page 315.
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LINKS
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MATHEMATICA
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Select[ Range[206], (Mod[ #, 9] == 0 || Mod[ #, 9] == 1 || Mod[ #, 9] == 4) && !IntegerQ[ Sqrt[ # ]] & ]
Select[Flatten[#+{0, 1, 4}&/@(9*Range[0, 30])], !IntegerQ[Sqrt[#]]&] (* Harvey P. Dale, Dec 29 2019 *)
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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