A153425 Numbers n such that n = p*phi(p) where p is product of the digits of n.

1, 2, 128, 2612736

Offset

1,2

Comments

No other terms < 10^59. - Chai Wah Wu, Dec 06 2015

Links

Table of n, a(n) for n=1..4.

Example

2612736 = (2*6*1*2*7*3*6)*phi(2*6*1*2*7*3*6), so 2612736 is in the sequence.

Crossrefs

Sequence in context: A012524 A012670 A209248 * A296060 A090121 A003369

Adjacent sequences: A153422 A153423 A153424 * A153426 A153427 A153428

Keyword

base,more,nonn

Author

Farideh Firoozbakht, Dec 26 2008

Status

approved