A071633 - OEIS

%I #9 Dec 13 2015 23:11:25

%S 19,82,59,46,56,34,26,20,31,52,10,56,24,34,0,30,20,20,32,37,32,24,30,

%T 37,34,24,2,26,16,35,22,46,15,20,38,14,20,58,11,22,42,24,33,46,3,20,0,

%U 18,10,12,44,56,0,29,8,0,31,14,38,44,0,30,28,9,24,18,30,34,29,8,0,50,6

%N Number of terms in the set InvPhi(65536*p(n)), where p(n) is the n-th prime.

%H Donovan Johnson, <a href="/A071633/b071633.txt">Table of n, a(n) for n = 1..1000</a>

%e invphi(65536*103)={6750209,13500418}, so a(27)=2; observe that a(15)=0 because 47 needs very large 2^i multiplier (instead of 65536) to give nonempty InvPhi set.

%p [seq(nops(invphi(65536*ithprime(i))),i=1..128)];

%Y Cf. A000010, A005277, A007617, A058888, A002202, A071629-A071634.

%K nonn

%O 1,1

%A _Labos Elemer_, May 30 2002