login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Odd composite numbers such that the sum of any two terms, plus 1, is composite.
0

%I #3 Mar 19 2015 09:38:17

%S 9,15,35,39,75,119,125,209,249,279,285,287,435,545,749,779,825,939,

%T 1065,1469,1505,1635,1655,2525,3107,3339,3689,3705,3999,4569,4905,

%U 5175,6125,6419,7475,8055,8855,9449,9659,10239,11379,14069,15135,16169,20699

%N Odd composite numbers such that the sum of any two terms, plus 1, is composite.

%e 35 is a term in the sequence because 35 is an odd composite, 35+9+1=45 is composite and 35+15+1=51 is composite. 33 is not a term in the sequence because 33+9+1 is prime (43).

%K easy,nonn

%O 1,1

%A _Randy L. Ekl_, Jan 01 2008