911111

Properties

Appears in sequences

• Primes that contain digits 1 and 9 only.at n=24A020457
• a(n) is the least prime > a(n-1) whose digits do not appear in a(n-1).at n=40A030284
• Start with the prime 11; next prime must exceed previous prime, contain no 0's and start with last digit of previous prime.at n=10A053649
• Primes of the form identical digits preceded by a 9.at n=4A090157
• Primes of the form 9*10^k + R_k, where R_k is the repunit (A002275) of length k.at n=1A093634
• Primes with digital product = 9.at n=11A107695
• Emirps with digits 1 and 9 only.at n=8A155507
• Larger of emirps (pairs) with digits 1 and 9 only.at n=3A155509
• Near-repdigit emirps.at n=37A173594
• The larger member of a near-repdigit emirp pair.at n=18A173596
• Largest n digit prime with the most digits equal to 1.at n=5A177999
• Lexicographically earliest increasing sequence of numbers with all odd digits alternating with numbers with all even digits.at n=48A180412
• Primes p such that sum and product of decimal digits of p are both semiprimes.at n=36A245381
• Largest n digit prime having at least n-1 digits equal to 1.at n=5A268702
• Prime numbersat n=72099