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A025022
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Least non-residue mod n is 5.
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0
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23, 46, 47, 73, 94, 97, 146, 167, 193, 194, 263, 313, 334, 337, 383, 386, 433, 457, 503, 526, 529, 577, 626, 647, 673, 674, 743, 766, 863, 866, 887, 914, 937, 983, 1006, 1033, 1058, 1081, 1103, 1153, 1154, 1223, 1294, 1297, 1346, 1367, 1486, 1487, 1583, 1607
(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}
isA025022(n)=residue(2, n) && residue(3, n) && !residue(5, n) (End)
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CROSSREFS
| Sequence in context: A122041 A040506 A081329 * A094694 A164010 A132682
Adjacent sequences: A025019 A025020 A025021 * A025023 A025024 A025025
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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