A102279 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.

1, 48, 720, 17280, 17915904000, 479219999055934390272000000000

Offset: 1

Author

Farideh Firoozbakht, Jan 08 2005

Keywords

• base
• less
• nonn

Comments

All terms are of the form 2^i*3^j*5^t.

No more terms < 10^100. - David Wasserman, Apr 03 2008

Examples

			17280 is in the sequence because 17280 = phi(1)!*phi(7)!*phi(2)!*phi(8)!*phi(0)!.
		

Crossrefs

Cf. A097655, A102280, A102281.