%I #22 Oct 19 2016 07:55:57
%S 0,1,1,2,1,3,1,3,2,4,1,5,1,4,5,2,3,6,1,3,5,7,1,5,7,2,4,8,1,7,3,9,1,6,
%T 4,3,9,2,8,7,5,10,1,5,7,11,1,7,9,10,8,11,2,5,3,4,6,12,1,5,3,11,9,13,1,
%U 8,4,13,2,11,7,14,1,11,13,7,9,3,5,15,1,9,6,13,7,3,5,15,2,12,14,10,4,11,8,16
%N Table T(n,k) = reciprocal of k-th number prime to n, modulo n, for 1 <= k <= phi(n).
%C T(n,k) = smallest m such that A038566(n,k) * m = 1 (mod n).
%C For n>1 every row begins with 1 and ends with n-1. T(n,k) = A038566(n,k)^(phi(n) - 1) (mod n). - _Geoffrey Critzer_, Jan 03 2015
%H Robert Israel, <a href="/A124224/b124224.txt">Table of n, a(n) for n = 1..10060</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/ModularInverse.html">Modular Inverse</a>
%F T(n,k) * A038566(n,k) = 1 (mod n), for n >=1 and k=1..A000010(n). - _Wolfdieter Lang_, Oct 06 2016
%e The table T(n,k) starts:
%e n\k 1 2 2 3 4 5 6 7 8 9 10 11
%e 1: 0
%e 2: 1
%e 3: 1 2
%e 4: 1 3
%e 5: 1 3 2 4
%e 6: 1 5
%e 7: 1 4 5 2 3 6
%e 8: 1 3 5 7
%e 9: 1 5 7 2 4 8
%e 10: 1 7 3 9
%e 11: 1 6 4 3 9 2 8 7 5 10
%e 12: 1 5 7 11
%e 13: 1 7 9 10 8 11 2 5 3 4 6 12
%e 14: 1 5 3 11 9 13
%e 15: 1 8 4 13 2 11 7 14
%e 16: 1 11 13 7 9 3 5 15
%e ...
%e n = 17: 1 9 6 13 7 3 5 15 2 12 14 10 4 11 8 16,
%e n = 18: 1 11 13 5 7 17,
%e n = 19: 1 10 13 5 4 16 11 12 17 2 7 8 3 15 14 6 9 18,
%e n = 20: 1 7 3 9 11 17 13 19.
%e ... reformatted (extended and corrected), - _Wolfdieter Lang_, Oct 06 2016
%p 0,seq(seq(i^(-1) mod m, i = select(t->igcd(t,m)=1, [$1..m-1])),m=1..100); # _Robert Israel_, May 18 2014
%t Table[nn = n; a = Select[Range[nn], CoprimeQ[#, nn] &];
%t PowerMod[a, -1, nn], {n, 1, 20}] // Grid (* _Geoffrey Critzer_, Jan 03 2015 *)
%Y Cf. A124223, A102057, A038566, A000010 (row lengths), A023896 (row sums after first)
%K nonn,tabf
%O 1,4
%A _Franklin T. Adams-Watters_, Oct 20 2006