OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
MATHEMATICA
okQ[n_]:=Module[{fd=FromDigits[Flatten[IntegerDigits/@ Transpose[ FactorInteger[ n]][[1]]]]}, PrimeOmega[fd]==PrimeNu[fd]==2]; With[ {sps = Select[Range[500], PrimeOmega[#] == PrimeNu[#] == 2 &]}, Select[ sps, okQ]] (* Harvey P. Dale, Nov 22 2011 *)
PROG
CROSSREFS
KEYWORD
nonn,base
AUTHOR
M. F. Hasler, Jun 19 2011
STATUS
approved