%I A002202 M0987 N0371
%S A002202 1,2,4,6,8,10,12,16,18,20,22,24,28,30,32,36,40,42,44,46,48,52,54,56,58,
%T A002202 60,64,66,70,72,78,80,82,84,88,92,96,100,102,104,106,108,110,112,116,120,
%U A002202 126,128,130,132,136,138,140,144,148,150,156,160,162,164,166,168,172,176
%N A002202 Values taken by totient function phi(m) (A000010).
%C A002202 These are the numbers n such that for some m the multiplicate group mod 
               m has order n.
%D A002202 J. W. L. Glaisher, Number-Divisor Tables. British Assoc. Math. Tables, 
               Vol. 8, Camb. Univ. Press, 1940, p. 64.
%D A002202 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A002202 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%H A002202 T. D. Noe, <a href="b002202.txt">Table of n, a(n) for n = 1..10000</a>
%H A002202 K. Ford, <a href="http://www.ams.org/era/1998-04-05/S1079-6762-98-00043-2/
               home.html">The distribution of totients</a>, Electron. Res. Announc. 
               Amer. Math. Soc. 4 (1998), 27-34.
%H A002202 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               TotientValenceFunction.html">Totient Valence Function</a>
%p A002202 with(numtheory); t1 := [seq(nops(invphi(n)), n=1..300)]; t2 := []: for 
               n from 1 to 300 do if t1[n] <> 0 then t2 := [op(t2), n]; fi; od: 
               t2;
%Y A002202 Cf. A000010, A002180, A032446, A058277.
%Y A002202 Sequence in context: A011860 A049445 A002174 this_sequence A049225 A076450 
               A097379
%Y A002202 Adjacent sequences: A002199 A002200 A002201 this_sequence A002203 A002204 
               A002205
%K A002202 nonn,nice,easy
%O A002202 1,2
%A A002202 N. J. A. Sloane (njas(AT)research.att.com).