login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A164322 Numbers n such that n=prime(P)+sigma(P), where P is product of digits of n. 2

%I #2 Mar 30 2012 17:37:48

%S 14,67673,25688777

%N Numbers n such that n=prime(P)+sigma(P), where P is product of digits of n.

%C The product of the digits of next term (if it exists) is greater than 2*10^8.

%e 25688777=prime(2*5*6*8*8*7*7*7)+sigma(2*5*6*8*8*7*7*7), so 25688777 is in the

%e sequence.

%t Do[If[n=Prime[m]+DivisorSigma[1,m];m==Apply[Times,IntegerDigits[n]],Print[n]],

%t {m,200000000}]

%Y Cf. A000040, A000203, A164323, A164324.

%K base,more,nonn,bref

%O 1,1

%A _Farideh Firoozbakht_, Aug 13 2009

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 29 03:51 EDT 2024. Contains 371264 sequences. (Running on oeis4.)