login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A164324 Numbers n such that n=prime(P)+pi(P), where P is product of digits of n. 2
16, 53, 185, 238, 2495, 19775, 4878937 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The product of the digits of next term (if it exists) is greater than 3*10^8.

a(8) > 10^12, if it exists. - Chai Wah Wu, Apr 24 2018

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

16 = prime(1*6) + pi(1*6), so 16 is in the sequence.

4878937 = prime(4*8*7*8*9*3*7) + pi(4*8*7*8*9*3*7), so 4878937 is in the sequence.

MATHEMATICA

Do[If[n=Prime[m]+PrimePi[m]; m==Apply[Times, IntegerDigits[n]], Print[n]], {m, 300000000}]

CROSSREFS

Cf. A000040, A000720, A164322, A164323.

Sequence in context: A087973 A117273 A137515 * A197246 A187104 A137741

Adjacent sequences:  A164321 A164322 A164323 * A164325 A164326 A164327

KEYWORD

base,more,nonn

AUTHOR

Farideh Firoozbakht, Aug 13 2009

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 21 18:58 EDT 2019. Contains 323444 sequences. (Running on oeis4.)