19999

Appears in sequences

• Numbers whose maximal base-10 run length is 4.at n=26A033285
• Greatest integer that is <= the sum of the n-th powers of its digits.at n=3A035027
• 4-white numbers: partition digits of n^4 into blocks of 4 starting at right; sum of these 4-digit numbers equals n.at n=12A037044
• Numbers having four 9's in base 10.at n=1A043528
• Smallest number whose digits sum to n-th prime.at n=11A046864
• Smallest number whose sum of digits is n.at n=37A051885
• a(n) is the smallest number k such that the letter "N" appears n times when k is written in English.at n=10A060227
• Concatenation of increasing number of alternating digits in base 2, starting with 1.at n=4A065760
• a(n) = A066557(n)/n.at n=4A066558
• a(n) = 2*10^(n-1) - 1.at n=4A067272
• Smallest composite number with digit sum n.at n=36A067524
• Numbers k such that prime(k)^3 == prime(k+1)^3 (mod k).at n=14A067785
• Number of palindromes of length <= n.at n=7A070199
• a(n) is the smallest composite number with the sum of digits = the n-th prime number.at n=11A073868
• a(n) = smallest k such that 2k has digit sum = n.at n=37A077491
• a(n) = smallest k such that 5k has a digit sum = n.at n=40A077492
• a(n) = smallest multiple of 7 with a digit sum = n.at n=35A077493
• Shallow diagonal of triangular spiral in A051682.at n=33A081275
• Triangle read by rows: T(n,k) = number of peakless Motzkin paths of length n having k (1,1) steps starting at level zero (can be easily expressed also in RNA secondary structure terminology).at n=60A089736
• Total number of smallest parts in all partitions of n into odd parts.at n=46A092268