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%I #18 Jun 15 2018 21:28:12
%S 0,1,1,1,2,1,0,1,1,9,7,1,7,7,13,1,7,1,7,1,7,5,7,1,7,23,1,21,7,19,7,1,
%T 13,15,28,1,7,11,31,1,7,7,7,25,37,3,7,1,0,49,37,9,7,1,43,49,1,49,7,1,
%U 7,49,28,1,37,37,7,21,67,49,7,1,7,49,43,45,28,25,7,1
%N a(n) = 7^n mod n.
%H Harry J. Smith and Seiichi Manyama, <a href="/A066438/b066438.txt">Table of n, a(n) for n = 1..10000</a> (first 1000 terms from Harry J. Smith)
%p seq(irem(7^n,n),n=1..80); # _Zerinvary Lajos_, Apr 20 2008
%t Table[PowerMod[7, n, n], {n, 80} ]
%o (PARI) { for (n=1, 1000, write("b066438.txt", n, " ", 7^n % n) ) } \\ _Harry J. Smith_, Feb 14 2010
%Y Cf. k^n mod n; A015910 (k=2), A066601 (k=3), A066602 (k=4), A066603 (k=5), A066604 (k=6), this sequence (k=7), A066439 (k=8), A066440 (k=9), A056969 (k=10), A066441 (k=11), A066442 (k=12), A116609 (k=13).
%K nonn
%O 1,5
%A _Robert G. Wilson v_, Dec 27 2001
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