9899999

Properties

Appears in sequences

• Primes that contain digits 8 and 9 only.at n=19A020472
• Primes at which sum of digits strictly increases.at n=38A061248
• Smallest n-digit prime with maximum digit sum.at n=6A069661
• Largest n-digit prime with maximum digit sum.at n=6A069662
• Smallest prime whose digital sum is equal to the n-th composite number, or 0 if no such prime exists.at n=42A073867
• Near-repdigit primes with 9 as repeated digit.at n=34A105975
• Primes with digit sum = 62.at n=0A107617
• Smallest prime whose digital sum is equal to the n-th composite number not congruent to 0 (modulo 3).at n=23A111380
• Least prime p with digit sum A047235(n).at n=20A152652
• a(n) is the smallest number k such that digsum(k)/tau(k) = prime(n) where tau(k) is the number of divisors of k and digsum(k) is the sum of the digits of k.at n=10A240915
• Primes p such that one digit appears exactly six times together with a single different digit.at n=30A257937
• Near-repdigit primes with only digits 9 and a single 8 in decimal expansion.at n=5A263431
• Prime numbersat n=658445