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!)
A068631 a(1) = 4; a(n) = smallest composite number different from the previous ones such that the sum of all the terms is a composite number. 1

%I #5 Mar 02 2024 15:49:24

%S 4,6,8,9,12,10,14,15,16,18,20,21,22,25,24,26,28,27,30,33,32,34,35,36,

%T 38,39,40,42,44,45,46,48,49,50,52,54,55,51,56,57,58,60,63,62,64,65,68,

%U 69,66,70,72,74,76,77,75,78,80,81,82,84,85,86,88,90,87,91,92,94,93,95

%N a(1) = 4; a(n) = smallest composite number different from the previous ones such that the sum of all the terms is a composite number.

%e 4+6+8+9 = 27. The next term is 12 instead of 10 as 27 +10 is a prime but 27 +12 = 39 is composite.

%K easy,nonn

%O 1,1

%A _Amarnath Murthy_, Feb 26 2002

%E More terms from Larry Reeves (larryr(AT)acm.org), Jun 21 2002

%E Offset corrected by _Sean A. Irvine_, Mar 02 2024

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 23 09:22 EDT 2024. Contains 371905 sequences. (Running on oeis4.)