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A057763 Least nonnegative square root of 5 mod n for n in A057762. 2
0, 1, 1, 0, 5, 4, 9, 5, 7, 11, 6, 9, 13, 7, 15, 11, 8, 26, 25, 17, 9, 20, 13, 19, 10, 45, 21, 15, 11, 51, 48, 35, 25, 23, 12, 17, 40, 68, 55, 25, 59, 13, 19, 30, 27, 85, 14, 76, 45, 95, 29, 65, 21, 15, 66, 51, 31, 103, 73, 35, 16, 23 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

T. D. Noe, Table of n, a(n) for n=1..1000

MATHEMATICA

A057762 = Prepend[ Select[ Range[300], Reduce[Mod[5 - k^2, #] == 0, k, Integers] =!= False &], 1]; a[n_] := Min[ r /. {ToRules[ Reduce[ Mod[r^2 - 5, A057762[[n]]] == 0, r, Integers] /. C[1] -> 0]}]; a[1] = 0; Table[a[n], {n, 1, 62}] (* Jean-Fran├žois Alcover, Sep 20 2012 *)

CROSSREFS

Sequence in context: A002389 A196758 A019776 * A198609 A054508 A110617

Adjacent sequences:  A057760 A057761 A057762 * A057764 A057765 A057766

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Nov 01 2000

EXTENSIONS

Corrected by T. D. Noe, Apr 19 2007 [The errors were caused by the faulty Maple command "mroot"]

STATUS

approved

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Last modified April 21 21:03 EDT 2018. Contains 302877 sequences. (Running on oeis4.)