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Search: id:A081642
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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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+0
2
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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; listen)
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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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MATHEMATICA
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Select[ Range[206], (Mod[ #, 9] == 0 || Mod[ #, 9] == 1 || Mod[ #, 9] == 4) && !IntegerQ[ Sqrt[ # ]] & ]
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CROSSREFS
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Sequence in context: A135548 A102502 A055984 this_sequence A120155 A129075 A095918
Adjacent sequences: A081639 A081640 A081641 this_sequence A081643 A081644 A081645
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KEYWORD
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easy,nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Mar 26 2003
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