The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
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!)
A159237 Composite numbers A046346 divided by the sum of their prime factors (counted with multiplicity). 1

%I #6 Jan 22 2016 06:43:47

%S 1,2,3,3,5,5,6,6,7,10,12,11,11,15,16,11,18,14,21,20,25,17,24,30,28,32,

%T 28,27,26,19,17,36,26,28,40,23,40,26,23,45,45,48,48,40,44,54,44,34,54,

%U 29,45,48,29,54,52,44,51,31,38,65,37,29,57,52,77,78,43,43,88,69,105,105

%N Composite numbers A046346 divided by the sum of their prime factors (counted with multiplicity).

%H Zak Seidov, <a href="/A159237/b159237.txt">Table of n, a(n) for n=1..1000</a>

%F a(n) = A046346(n)/sopfr(A046346(n)) = A046346(n)/A001414(A046346(n)).

%e n=1: A046346(1)=4, A046346(4)=4, a(1)=4/4=1;

%e n=2: A046346(2)=16, A046346(16)=8, a(2)=16/8=2;

%e n=3: A046346(3)=27, A046346(27)=9, a(3)=27/9=3;

%e n=4: A046346(4)=30, A046346(30)=10, a(4)=30/10=3;

%e n=10: A046346(10)=150, A046346(150)=15, a(10)=150/15=10;

%e n=100: A046346(100)=3840, A046346(3840)=24, a(100)=3840/24=160;

%e n=1000: A046346(1000)=102860, A046346(102860)=185, a(1000)=102860/185=556.

%Y Cf. A046346 Composite numbers that are divisible by the sum of their prime factors (counted with multiplicity), A001414 Integer log of n: sum of primes dividing n (with repetition), sopfr(n), A036844 Numbers n such that n / sopfr(n) is an integer, where sopr() = sum-of-prime-factors, A001414.

%K nonn

%O 1,2

%A _Zak Seidov_, Apr 06 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 June 5 04:27 EDT 2024. Contains 373102 sequences. (Running on oeis4.)