OFFSET
1,1
COMMENTS
Heuristically, there are about 4^n * 275/(48*Pi^2) n-digit terms of this sequence. - Charles R Greathouse IV, Oct 18 2011
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
EXAMPLE
a(6) = 23, 2 and 3 are both primes.
MATHEMATICA
Select[Range[3000], Abs[MoebiusMu[#]] == 1 && Union[PrimeQ[IntegerDigits[#]]] == {True} &] (* Alonso del Arte, Oct 18 2011 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Amarnath Murthy, Jun 16 2001
EXTENSIONS
Corrected and extended by Larry Reeves (larryr(AT)acm.org), Jun 18 2001
Offset corrected by Arkadiusz Wesolowski, Oct 18 2011
STATUS
approved