A268616 - OEIS

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A268616

Least squarefree primitive root of the n-th prime.

1, 2, 2, 3, 2, 2, 3, 2, 5, 2, 3, 2, 6, 3, 5, 2, 2, 2, 2, 7, 5, 3, 2, 3, 5, 2, 5, 2, 6, 3, 3, 2, 3, 2, 2, 6, 5, 2, 5, 2, 2, 2, 19, 5, 2, 3, 2, 3, 2, 6, 3, 7, 7, 6, 3, 5, 2, 6, 5, 3, 3, 2, 5, 17, 10, 2, 3, 10, 2, 2, 3, 7, 6, 2, 2, 5, 2, 5, 3, 21, 2, 2, 7, 5, 15, 2, 3, 13, 2, 3, 2, 13, 3, 2, 7, 5, 2, 3, 2, 2, 2, 2, 2, 3, 3

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OFFSET

1,2

LINKS

Joerg Arndt, Table of n, a(n) for n = 1..10000

Stephen D. Cohen, Tim Trudgian, On the least square-free primitive root modulo p, arXiv:1602.02440 [math.NT], (7-February-2016)

MATHEMATICA

Reap[For[p = 2, p<10^3, p = NextPrime[p], s = Select[PrimitiveRootList[p], SquareFreeQ]; Sow[If[s == {}, 0, First[s]]]]][[2, 1]] (* Jean-François Alcover, Sep 03 2016 *)

PROG

(PARI) forprime(p=2, 10^3, for(g=1, p-1, if(issquarefree(g)&&znorder(Mod(g, p))==p-1, print1(g, ", "); break)));

CROSSREFS

Cf. A001918.

Sequence in context: A127809 A127810 A001918 * A331506 A002233 A241516

Adjacent sequences: A268613 A268614 A268615 * A268617 A268618 A268619

KEYWORD

nonn

AUTHOR

Joerg Arndt, Feb 09 2016

STATUS

approved