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A096103 Table read by rows: row n contains the quadratic residues modulo n which are coprime to n. 0
1, 1, 1, 1, 4, 1, 1, 2, 4, 1, 1, 4, 7, 1, 9, 1, 3, 4, 5, 9, 1, 1, 3, 4, 9, 10, 12, 1, 9, 11, 1, 4, 1, 9, 1, 2, 4, 8, 9, 13, 15, 16, 1, 7, 13, 1, 4, 5, 6, 7, 9, 11, 16, 17, 1, 9, 1, 4, 16, 1, 3, 5, 9, 15, 1, 2, 3, 4, 6, 8, 9, 12, 13, 16, 18, 1, 1, 4, 6, 9, 11, 14, 16, 19, 21, 24, 1, 3, 9, 17, 23, 25, 1, 4 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,5

COMMENTS

Each '1' begins a row.

Row lengths are A046073. - Geoffrey Critzer, Jan 02 2015

LINKS

Table of n, a(n) for n=2..95.

Eric Weisstein's World of Mathematics, Quadratic Residue

EXAMPLE

1;

1;

1;

1,4;

1;

1, 2, 4;

1;

1, 4, 7;

1, 9;

1, 3, 4, 5, 9;

1;

1, 3, 4, 9, 10, 12;

1, 9, 11;

1, 4;

MATHEMATICA

Table[Union[Mod[Select[Range[n], CoprimeQ[#, n] &]^2, n]], {n, 2, 20}] // Grid (* Geoffrey Critzer, Jan 02 2015 *)

PROG

(PARI) maybesqgcd1(n) = { for(x=2, n, b=floor(x/2); a=vector(b+1); for(y=1, b, z=y^2%x; if(z<>0, a[y]=z; ) ); s=vecsort(a); c=1; for(j=2, b+1, if(s[j]<>s[j-1], c++; if(gcd(x, s[j])==1, print1(s[j]", ")) ) ); ) }

CROSSREFS

Sequence in context: A325529 A264534 A228489 * A204456 A143441 A279206

Adjacent sequences:  A096100 A096101 A096102 * A096104 A096105 A096106

KEYWORD

nonn,tabf

AUTHOR

Cino Hilliard, Jul 21 2004

EXTENSIONS

Edited by Don Reble, Apr 16 2007

STATUS

approved

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Last modified October 23 23:51 EDT 2019. Contains 328379 sequences. (Running on oeis4.)