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Search: id:A081648
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| A081648 |
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Integers congruent to 0, 1, 4, 9, 16, 25, 36, 49 or 64 (mod 81) which are not squares. |
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+0
2
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| 82, 85, 90, 97, 106, 117, 130, 145, 162, 163, 166, 171, 178, 187, 198, 211, 226, 243, 244, 247, 252, 259, 268, 279, 292, 307, 325, 328, 333, 340, 349, 360, 373, 388, 405, 406, 409, 414, 421, 430, 454, 469, 486, 487, 490, 495, 502, 511, 522, 535, 550, 567
(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[567], (Mod[ #, 81] == 0 || Mod[ #, 81] == 1 || Mod[ #, 81] == 4 || Mod[ #, 81] == 9 || Mod[ #, 81] == 16 || Mod[ #, 81] == 25 || Mod[ #, 81] == 36 || Mod[ #, 81] == 49 || Mod[ #, 81] == 64) && !IntegerQ[ Sqrt[ # ]] & ]
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CROSSREFS
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Cf. A080151, A080160.
Adjacent sequences: A081645 A081646 A081647 this_sequence A081649 A081650 A081651
Sequence in context: A043632 A077684 A044982 this_sequence A025370 A099067 A025361
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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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