A129864 Numbers that are both lucky and emirp.

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

Amiram Eldar, Table of n, a(n) for n = 1..10000

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

Cf. A000040, A000959, A004086, A006567, A031157.

Sequence in context: A176181 A023274 A349636 * A350409 A080387 A348300

Adjacent sequences: A129861 A129862 A129863 * A129865 A129866 A129867

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