OFFSET
1,1
COMMENTS
Numbers that are divisible by both primes of some twin-prime pair. Harvey P. Dale, Aug 18 2017
By definition, if k is in the sequence, then so is every positive multiple of k. - Richard Locke Peterson, Aug 17 2017
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Range[600], MemberQ[Differences[Transpose[FactorInteger[#]][[1]]], 2]&] (* Harvey P. Dale, Sep 19 2011 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Feb 20 2003
EXTENSIONS
Definition clarified by N. J. A. Sloane, Aug 18 2017
STATUS
approved