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%I #6 Mar 31 2012 13:20:34
%S 257,4373,735443,3294173,28723679,533810141,38277341,47579927,
%T 982740799,33956348611,77141582851,174329354539,82984891817,
%U 109051450427,83209719751,1352085061013,171168499897,1822904926391,2870322429133,3589197993463,2603594622571,5834621843669,1411025860033,20635686238253,1580041060459,26763849212297,8216934406781,28482190726739,97876187600351
%N Smallest odd prime base q such that p^7 divides q^(p-1) - 1, where p = Prime[n].
%H W. Keller and J. Richstein <a href="http://www1.uni-hamburg.de/RRZ/W.Keller/FermatQuotient.html">Fermat quotients that are divisible by p</a>.
%o (PARI) { a(n) = local(p,x,y); if(n==1,return(257)); p=prime(n); x=znprimroot(p^7)^(p^6); vecsort( vector(p-1,i, y=lift(x^i);while(!isprime(y),y+=p^7);y ) )[1] } - _Max Alekseyev_, May 30 2007
%Y Cf. A125609, A125610, A125611, A125612, A125632, A125633, A125634, A125635, A125636, A125637, A125645, A125646, A125647, A125649.
%K nonn
%O 1,1
%A _Alexander Adamchuk_, Nov 29 2006
%E More terms from _Max Alekseyev_, May 30 2007