799999

Properties

Appears in sequences

• Primes that contain digits 7 and 9 only.at n=19A020471
• a(1) = 2; a(n+1) is obtained by trying to change just one digit of a(n), starting with the least significant digit, until a new prime is reached. Take the lexicographically earliest sequence. Digits may be replaced by any larger digit.at n=21A059498
• Primes at which sum of digits strictly increases.at n=31A061248
• Smallest prime with digit sum n, or 0 if no such prime exists.at n=51A067180
• The smallest prime with a possible given digit sum.at n=34A067523
• Smaller of two consecutive primes which have no common digits.at n=24A068803
• Smallest prime whose digital sum is equal to the n-th composite number, or 0 if no such prime exists.at n=35A073867
• Primes of the form 2^r*5^s - 1.at n=24A077313
• Primes of the form identical digits preceded by a 7.at n=8A090155
• Primes of the form 8*10^k - 1.at n=3A093947
• Near-repdigit primes with 9 as repeated digit.at n=24A105975
• Primes with digit sum = 52.at n=0A106781
• Smallest prime whose digital sum is equal to the n-th composite number not congruent to 0 (modulo 3).at n=19A111380
• Smallest number whose sum of digits is 3n+1.at n=17A133264
• Smallest number whose sum of digits is 2n.at n=26A133296
• Primes consisting of a digit and a nonempty string of 9's (i.e., primes of the form k*10^m - 1, where k is any digit).at n=17A141311
• Least prime p with digit sum A047235(n).at n=17A152652
• a(n) = 8*10^n - 1.at n=5A198973
• Numbers n such that the digits of antisigma(n) end in sigma(n).at n=7A248819
• Numbers m such that antisigma(m) contains sigma(m) as a substring.at n=15A258413