

A143665


a(n) is the least prime such that the multiplicative order of 5 mod a(n) equals n.


0



2, 3, 31, 13, 11, 7, 19531, 313, 19, 521, 12207031, 601, 305175781, 29, 181, 17, 409, 5167, 191, 41, 379, 23, 8971, 390001, 101, 5227, 109, 234750601, 59, 61, 1861, 2593, 199, 3061, 211, 37, 149, 761, 79, 241, 2238236249, 43, 1644512641, 89, 1171, 47
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..46.


MATHEMATICA

p = 2; t = Table[0, {100}]; While[p < 3000000001, a = MultiplicativeOrder[5, p]; If[0 < a < 101 && t[[a]] == 0, t[[a]] = p]; p = NextPrime@ p]; t (* Robert G. Wilson v, Oct 13 2014 *)


CROSSREFS

Cf. A064081, A143663, A112092.
Sequence in context: A093712 A035514 A114009 * A074479 A272043 A136150
Adjacent sequences: A143662 A143663 A143664 * A143666 A143667 A143668


KEYWORD

nonn


AUTHOR

Vladimir Shevelev, Aug 28 2008


EXTENSIONS

a(23)a(40) from Robert G. Wilson v, Oct 13 2014
a(41)a(46) from Robert G. Wilson v, Oct 15 2014


STATUS

approved



