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

9, 15, 35, 39, 75, 119, 125, 209, 249, 279, 285, 287, 435, 545, 749, 779, 825, 939, 1065, 1469, 1505, 1635, 1655, 2525, 3107, 3339, 3689, 3705, 3999, 4569, 4905, 5175, 6125, 6419, 7475, 8055, 8855, 9449, 9659, 10239, 11379, 14069, 15135, 16169, 20699

Offset

1,1

Links

Table of n, a(n) for n=1..45.

Example

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).

Crossrefs

Sequence in context: A111148 A125216 A058505 * A146475 A307217 A100556

Adjacent sequences: A133760 A133761 A133762 * A133764 A133765 A133766

Keyword

easy,nonn

Author

Randy L. Ekl, Jan 01 2008

Status

approved