1999999999

Appears in sequences

• Replace each 1 in decimal expansion of n with 1 1's, each 2 with 2 2's, etc. (0 vanishes).at n=18A048376
• a(n) is the smallest number k such that the letter "N" appears n times when k is written in English.at n=24A060227
• a(n) = 2*10^(n-1) - 1.at n=9A067272
• Number of palindromes of length <= n.at n=17A070199
• a(n) = 2n^(n-1) - 1.at n=9A093460
• n-th row of the following triangle contains n terms of an arithmetic progression with the first term 1 such that the sum is the least possible n-th power. Sequence contains the leading diagonal.at n=9A093844
• Smallest semiprime containing exactly n 9's.at n=8A104775
• Smallest semiprime ending in exactly n 9's.at n=8A106663
• Smallest number whose sum of digits is 3n+1.at n=27A133264