OFFSET
1,1
COMMENTS
Terms that included in A173968 but Not included in the current seq are: 366,2526,18726,220326,430926,637566,814326,..
The number of prime factors of each of the 3 consecutive numbers must be 2 even when counted with multiplicity. - Harvey P. Dale, Aug 14 2021
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
MATHEMATICA
f[n_]:=Last/@FactorInteger[n]=={1, 1}; lst={}; Do[If[f[n], If[f[n+1]&&f[n+2], AppendTo[lst, 3*n+3]]], {n, 8!}]; lst2=lst
Total[#]+Mean[#]&/@SequencePosition[Table[If[PrimeNu[n]==PrimeOmega[n]==2, 1, 0], {n, 4000}], {1, 1, 1}] (* Harvey P. Dale, Aug 14 2021 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladimir Joseph Stephan Orlovsky, Mar 03 2010
EXTENSIONS
Definition clarified by Harvey P. Dale, Aug 14 2021
STATUS
approved