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!)
A328738 Numbers k such that at least one of sopfr(k-1) and sopfr(k+1) is greater than or equal to 4*sopfr(k). 2

%I #19 Dec 02 2019 13:52:59

%S 48,54,60,66,70,72,78,80,84,88,90,96,98,100,102,104,108,110,112,114,

%T 126,128,130,132,135,136,138,140,147,150,152,156,162,165,168,174,180,

%U 182,190,192,195,196,198,200,210,222,224,225,228,230,232,234

%N Numbers k such that at least one of sopfr(k-1) and sopfr(k+1) is greater than or equal to 4*sopfr(k).

%C k-1 or k+1 or both have sums of prime factors at least 4 times the sum of prime factors of k.

%Y Cf. A001414, A328736, A328737.

%K nonn

%O 1,1

%A _Robert Bilinski_, Oct 26 2019

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 July 23 09:37 EDT 2024. Contains 374547 sequences. (Running on oeis4.)