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Greatest number m such that phi(m) = n*tau(m), with phi=A000010 and tau=A000005; a(n)=0 if no such m exists.
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%I #14 Oct 18 2019 16:48:14

%S 30,120,210,420,330,840,294,1260,1080,1320,690,2520,318,1470,2310,

%T 3360,0,3780,0,4620,1290,2760,1410,5460,3000,1590,7560,5880,1770,9240,

%U 0,10080,4830,1236,3234,10920,894,0,2370,13860,2490,6090,1038,9660,11880

%N Greatest number m such that phi(m) = n*tau(m), with phi=A000010 and tau=A000005; a(n)=0 if no such m exists.

%C Each term is a multiple of 6. [_Max Alekseyev_, Mar 01 2010]

%H Donovan Johnson, <a href="/A112955/b112955.txt">Table of n, a(n) for n = 1..10000</a>

%e a(1) = A020488(A112954(1)) = A020488(7) = 30;

%e a(2) = A062516(A112954(2)) = A062516(9) = 120;

%e a(3) = A063469(A112954(3)) = A063469(10) = 210;

%e a(4) = A063470(A112954(4)) = A063470(9) = 420.

%Y Cf. A112954.

%Y Cf. A175667. [_Enrique PĂ©rez Herrero_, Oct 22 2010]

%K nonn

%O 1,1

%A _Reinhard Zumkeller_, Oct 07 2005

%E More terms from _Max Alekseyev_, Mar 01 2010