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A025021
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Least non-residue mod n is 3.
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1
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7, 14, 17, 31, 34, 41, 49, 62, 79, 82, 89, 98, 103, 113, 119, 127, 137, 151, 158, 161, 178, 199, 206, 217, 223, 226, 233, 238, 254, 257, 271, 274, 281, 287, 289, 302, 322, 329, 343, 353, 367, 391, 398, 401, 434, 439, 446, 449, 463, 466, 487, 497, 511, 514, 521, 527, 542
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| Eric Weisstein's World of Mathematics, Quadratic Nonresidue
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PROG
| Contribution from Michael B. Porter (michael_b_porter(AT)yahoo.com), Apr 18 2010: (Start)
(PARI) residue(n, m)={local(r); r=0; for(i=1, floor(m/2), if(i^2%m==n, r=1)); r}
isA025021(n)=residue(2, n) && !residue(3, n) (End)
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CROSSREFS
| Sequence in context: A092433 A056203 A178732 * A131439 A102041 A070792
Adjacent sequences: A025018 A025019 A025020 * A025022 A025023 A025024
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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