|
%I #5 Mar 30 2012 17:38:04
%S 1,48,720,17280,17915904000,479219999055934390272000000000
%N Numbers n such that n = phi(d_1)!*phi(d_2)!* ... *phi(d_k)! where d_1 d_2 ... d_k is the decimal expansion of n and assume that phi(0)=0.
%C All terms are of the form 2^i*3^j*5^t.
%C No more terms < 10^100. - _David Wasserman_, Apr 03 2008
%e 17280 is in the sequence because 17280 = phi(1)!*phi(7)!*phi(2)!*phi(8)!*phi(0)!.
%Y Cf. A097655, A102280, A102281.
%K base,less,nonn
%O 1,2
%A _Farideh Firoozbakht_, Jan 08 2005
| 