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A133763 Odd composite numbers such that the sum of any two terms, plus 1, is composite. 0

%I

%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

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Last modified October 16 13:48 EDT 2021. Contains 348042 sequences. (Running on oeis4.)