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A153425
Numbers n such that n = p*phi(p) where p is product of the digits of n.
0
1, 2, 128, 2612736
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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
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Last modified September 18 10:04 EDT 2024. Contains 375999 sequences. (Running on oeis4.)