9999991

Properties

Appears in sequences

• Largest n-digit prime.at n=6A003618
• Smallest prime beginning with exactly n 9's.at n=6A065592
• Largest n-digit prime with all odd digits.at n=6A068694
• Smallest prime whose product of digits is 3^n.at n=12A088653
• Primes of the form identical odd digits followed by a 1.at n=10A089346
• Primes of the form identical digits followed by a 1.at n=17A089347
• Primes of the form 90*R_k + 1, where R_k is the repunit (A002275) of length k.at n=2A093177
• Smallest and largest primes pairwise displayed with k digits from k=2,3,... with repeated decimal digits.at n=11A099630
• Smallest and largest of the n-digit primes.at n=13A101592
• Largest n-digit zeroless prime with nonprime digits.at n=5A103545
• Primes of the form aaaa...aa1 where a is 6, 7, 8 or 9.at n=7A109549
• Prime nearest to 10^n. In case of a tie, choose the smaller.at n=7A115062
• Triangle read by rows n>=0: the largest prime <= m^n+2 in columns m=3..n+3.at n=35A118132
• Largest prime <= square root of 10^n.at n=13A132153
• Smallest and largest primes with number of decimal digits equal to n-th prime.at n=7A133833
• Largest prime with number of decimal digits equal to n-th prime.at n=3A133836
• Prime numbers of the form 10^k +- 9.at n=6A144246
• a(n) = largest member of the n-th term in S(10) (defined in Comments).at n=12A158579
• Primes composed of digit {1,9} and with digit sum 9*k+1.at n=10A164890
• a(n) = 10^n - 9.at n=6A170955