499999

Appears in sequences

• Smallest number whose sum of digits is n.at n=49A051885
• Numbers n such that Sum_{k=1..n} d(k) is an integer where d(k) is the decimal fraction 0.k (e.g. d(999)=0.999).at n=10A054464
• Numbers k such that Sum_{j=1..k} d(j) is an integer where d(j) is the decimal fraction 0.2j (e.g., d(14) = 0.28).at n=9A054465
• Trimorphic but not bimorphic nor automorphic.at n=42A056032
• Smallest number whose sum of digits is n^2.at n=7A061104
• a(n) = n*10^n - 1.at n=4A064756
• a(n) is the smallest composite number with the sum of digits = the n-th composite number.at n=32A073866
• Numbers n such that n concatenated with n+1 is triangular.at n=21A094609
• Smallest number whose sum of digits is 2n+1.at n=24A131668
• Smallest number whose sum of digits is 3n+1.at n=16A133264
• Number of numbers removed in each step of Eratosthenes's sieve for 10^6.at n=0A145539
• a(1)=0, a(n+1) is the smallest nonprime with sum of digits > sum of digits of a(n).at n=45A156673
• The smallest composite number larger than the n-th composite number, which has a sum of digits equal to the n-th composite number.at n=32A161551
• Numbers that are the sum or product of two numbers, such that the sum and product have reversed digits.at n=14A166749
• Lexicographically earliest injective sequence such that a(n) = A007953(a(a(n))), where A007953 = sum of digits (in base 10).at n=48A167152
• Numbers n such that (n+n+1) divides the decimal concatenation [n, n+1].at n=11A173712
• Numbers n with k digits such that n^2 == 1 (mod 10^k).at n=28A181607
• a(n) = 5*10^n - 1.at n=5A198971
• Smallest odd number with digit sum equal to n.at n=48A205960
• Smallest integer m > n such that both n*m and (n+1)*(m+1) are squares.at n=31A212651