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 A136804 Nonsquares mod 257. 2
 3, 5, 6, 7, 10, 12, 14, 19, 20, 24, 27, 28, 33, 37, 38, 39, 40, 41, 43, 45, 47, 48, 51, 53, 54, 55, 56, 63, 65, 66, 69, 71, 74, 75, 76, 77, 78, 80, 82, 83, 85, 86, 87, 90, 91, 93, 94, 96, 97, 101, 102, 103, 105, 106, 107, 108, 109, 110, 112, 115, 119, 125, 126 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Because 257 is a Fermat prime, these numbers are all primitive roots (mod 257). Complement of A136803. LINKS Nathaniel Johnston, Table of n, a(n) for n = 1..128 (full sequence) FORMULA a(n) + a(129-n) = 257. MAPLE A136804 := {\$(0..256)}: for n from 0 to 256 do A136804 := A136804 minus {n^2 mod 257}: od: op(sort(convert(A136804, list))); # Nathaniel Johnston, Jun 23 2011 MATHEMATICA p=257; Select[Range[0, p-1], JacobiSymbol[ #, p]==-1&] CROSSREFS Sequence in context: A047328 A028811 A034035 * A129802 A023854 A092559 Adjacent sequences:  A136801 A136802 A136803 * A136805 A136806 A136807 KEYWORD fini,full,easy,nonn AUTHOR T. D. Noe, Jan 22 2008 STATUS approved

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