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

1,2

Comments

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

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

Links

Table of n, a(n) for n=1..6.

Example

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

Crossrefs

Cf. A097655, A102280, A102281.

Sequence in context: A138411 A361188 A186162 * A132464 A145155 A105948

Adjacent sequences: A102276 A102277 A102278 * A102280 A102281 A102282

Keyword

base,less,nonn

Author

Farideh Firoozbakht, Jan 08 2005

Status

approved