A159064 Emirps which remain primes when rotated by 180 degrees on a digital clock display.

199, 1061, 1091, 1109, 1181, 1601, 1669, 1811, 1901, 10061, 10069, 10091, 10909, 11909, 16001, 18691, 18911, 19001, 19661, 19801, 101119, 101611, 106681, 106699, 106861, 108881, 109609, 109891, 110119, 110881, 110989, 111119, 111869, 111919, 116911

Offset

1,1

Comments

The sequence contains all bemirps A048895.

Links

Table of n, a(n) for n=1..35.

Formula

Intersection of A048890 and A006567.

Example

1109 is an emirp (prime, and the reverse 9011 is also prime), it contains only digits 0,1,6,8 or 9 and can be rotated to form 6011, which is also prime. So 1109 is in the sequence.

Crossrefs

Cf. A145750.

Sequence in context: A308802 A142570 A155507 * A117594 A052188 A086977

Adjacent sequences: A159061 A159062 A159063 * A159065 A159066 A159067

Keyword

base,nonn

Author

Lekraj Beedassy, Apr 04 2009

Extensions

18691 and 18911 inserted, extended by R. J. Mathar, Apr 05 2009

Status

approved