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Search: id:A081643
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| A081643 |
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Integers congruent to 0, 1, 4 or 9 (mod 16) which are not squares. |
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+0
2
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| 17, 20, 32, 33, 41, 48, 52, 57, 65, 68, 73, 80, 84, 89, 96, 97, 105, 112, 113, 116, 128, 129, 132, 137, 145, 148, 153, 160, 161, 164, 176, 177, 180, 185, 192, 193, 201, 208, 209, 212, 217, 224, 228, 233, 240, 241, 244, 249, 257, 260, 265, 272, 273, 276, 281
(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[287], (Mod[ #, 16] == 0 || Mod[ #, 16] == 1 || Mod[ #, 16] == 4 || Mod[ #, 16] == 9) && !IntegerQ[ Sqrt[ # ]] & ]
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CROSSREFS
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Sequence in context: A134539 A034069 A116037 this_sequence A045020 A069961 A140146
Adjacent sequences: A081640 A081641 A081642 this_sequence A081644 A081645 A081646
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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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