1191191

Properties

Appears in sequences

• Primes that contain digits 1 and 9 only.at n=30A020457
• Emirps with digits 1 and 9 only.at n=13A155507
• Lesser of emirps (pairs) with digits 1 and 9 only.at n=7A155508
• Primes formed by concatenating k, k, and 1 for k >= 1.at n=30A210511
• Periodic primes: primes p whose decimal expansion can be written as sss...st, where s is nonempty string of digits not beginning with 0, there are at least two copies of s, and t (which may be absent) is a prefix of s.at n=12A232066
• Prime numbersat n=92311