A145750 Primes which become emirps when rotated by 180 degrees on a digital clock display.

661, 1061, 1091, 1181, 1601, 1811, 1901, 6011, 6991, 10061, 10091, 10861, 11681, 16001, 16981, 19001, 19961, 60601, 60611, 69001, 106861, 108161, 108881, 109891, 110881, 116881, 116911, 118081, 118861, 119101, 119611, 160861, 161611, 168601, 169691

Offset: 1

Author

Lekraj Beedassy, Apr 04 2009

Keywords

• nonn
• base

Comments

The sequence contains all bemirps A048895.

Subsequence of A057770. [R. J. Mathar, Apr 05 2009]

Examples

			1109 is a prime. After 2D rotation it is 6011, which is prime. However, 6011 is not an emirp because 1106 is not prime. So 1109 is not in the sequence.
		

Extensions

1109 removed, 6011 inserted etc. by R. J. Mathar, Apr 05 2009