OFFSET
1,1
COMMENTS
Sequence A039833 is a subsequence.
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
Daniel C. Mayer, Define an "m-triple" to consist of three consecutive squarefree positive integers, each with exactly m prime divisors, Number Theory group on LinkedIn.com
EXAMPLE
33 is in the sequence because 33, 34, 35 are all squarefree semiprimes.
55 is in the sequence because 55, 57, 58 (we ignore 56 because it's not squarefree) are all squarefree semiprimes.
MATHEMATICA
Transpose[Select[Partition[Select[Range[1000], SquareFreeQ], 3, 1], Union[ PrimeOmega[ #]] =={2}&]][[1]] (* Harvey P. Dale, Feb 07 2016 *)
PROG
CROSSREFS
KEYWORD
nonn
AUTHOR
M. F. Hasler, May 18 2014
STATUS
approved