login
A129864
Numbers that are both lucky and emirp.
1
13, 31, 37, 73, 79, 739, 769, 937, 991, 1009, 1021, 1201, 1231, 1249, 1471, 1597, 1723, 1831, 1879, 1933, 3049, 3109, 3121, 3163, 3301, 3433, 3571, 3613, 3697, 3889, 7207, 7321, 7459, 7507, 7603, 7687, 7717, 7951, 7963, 9349, 9403, 9421, 9547, 9613, 9643
OFFSET
1,1
LINKS
FORMULA
A000959 INTERSECTION A006567. a(n) is n element of A000959 AND a(n) is an element of A000040 AND R(a(n)) = A004086(a(n)) is an element of A000040.
EXAMPLE
a(9) = 1009 because 1009 is a lucky number A000959(154) and 1009 is an emirp because 1009 is prime and R(1009) = 9001 is prime (but is not lucky).
CROSSREFS
KEYWORD
base,easy,nonn,less
AUTHOR
Jonathan Vos Post, May 23 2007
EXTENSIONS
Corrected and extended by R. J. Mathar, Jun 12 2007
STATUS
approved