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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
1, 48, 720, 17280, 17915904000, 479219999055934390272000000000 (list; graph; refs; listen; history; text; internal format)
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: A233152 A138411 A186162 * A132464 A145155 A105948

Adjacent sequences:  A102276 A102277 A102278 * A102280 A102281 A102282

KEYWORD

base,less,nonn

AUTHOR

Farideh Firoozbakht, Jan 08 2005

STATUS

approved

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Last modified June 15 08:14 EDT 2021. Contains 345048 sequences. (Running on oeis4.)