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!)
A048839 Numbers n dividing P(n)!, where P(n) is the largest prime factor of n. 3

%I #12 Dec 17 2015 03:25:57

%S 2,3,5,6,7,10,11,13,14,15,17,19,20,21,22,23,26,28,29,30,31,33,34,35,

%T 37,38,39,40,41,42,43,44,46,47,51,52,53,55,56,57,58,59,60,61,62,63,65,

%U 66,67,68,69,70,71,73,74,76,77,78,79,82,83,84,85,86,87,88,89,91,92,93,94

%N Numbers n dividing P(n)!, where P(n) is the largest prime factor of n.

%C Solutions to Diophantine equation P(n)=K(n), where P(n) is the largest prime which divides n and K(n) is the Kempner function A002034.

%D P. Erdős, C. Ashbacher, Thoughts of Pal Erdos on Some Smarandache Notions, Smarandache Notions Journal, Vol. 8, No. 1-2-3, 1997, 220-224.

%F a(n) ~ n. - _Charles R Greathouse IV_, Sep 20 2012

%o (PARI) is(n)=my(s=factor(n)[, 1]); s[#s]!%n==0 \\ _Charles R Greathouse IV_, Sep 20 2012

%Y Complement is A057109.

%K nonn,easy

%O 1,1

%A Charles T. Le (charlestle(AT)yahoo.com)

%E Corrected and extended by _Naohiro Nomoto_, Jul 14 2001

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 April 20 02:09 EDT 2024. Contains 371798 sequences. (Running on oeis4.)