OFFSET
1,1
COMMENTS
All terms are multiples of 3.
Numbers k such that 4*k+1 and 16*k+5 are both prime. - Vincenzo Librandi, Dec 13 2010
These k cannot have least significant digits 0, 1, 5, or 6. - J. M. Bergot, Jul 06 2011
LINKS
R. J. Mathar, Table of n, a(n) for n = 1..1738
FORMULA
a(n) = 3 * A179652(n). - Joerg Arndt, Jul 10 2011
PROG
(Magma) [n: n in [0..3000] | IsPrime(4*n+1)and IsPrime(16*n+5)] // Vincenzo Librandi, Dec 13 2010
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, May 26 2007
STATUS
approved