99998

Appears in sequences

• a(n)^3 is smallest cube containing exactly n 9's.at n=7A048374
• a(n) is the largest number which can be formed with no zeros, using least number of digits and having digit sum = n.at n=43A061219
• Smallest even number with digit sum n.at n=43A069532
• Largest n-digit squarefree number.at n=4A074110
• {Concatenation of n-1 and n+1}/n where n is a member of A069871.at n=9A077192
• a(n) = sqrt(A084004(n)).at n=17A084005
• Largest n-digit semiprime.at n=4A098450
• Positive integers k such that f(k)+f(k)=concatenation of k and k, where f(k)=k(k+3)/2 (A000096).at n=4A099150
• Numbers n such that every digit of both n and n^2 contains a loop (only digits 0,4,6,8,9 in n and n^2).at n=31A107626
• Numbers A such that the square of concatenation AA is of form NNMM.at n=17A107677
• Numbers k such that k concatenated with k-4 gives the product of two numbers which differ by 5.at n=11A116130
• Numbers k such that k*(k+6) gives the concatenation of two numbers m and m-9.at n=4A116229
• n times n+5 gives the concatenation of two numbers m and m-6.at n=14A116249
• Numbers k such that k*(k+4) gives the concatenation of two numbers m and m-3.at n=11A116267
• Numbers k such that k*(k+3) gives the concatenation of a number m with itself.at n=11A116287
• Numbers k such that k and k^2 use only the digits 0, 4, 6, 8 and 9.at n=32A136956
• a(n) is the largest n-digit number with exactly 4 divisors.at n=4A182648
• a(n) is the largest 5-digit number with exactly n divisors, or a(n) = 0 if no such number exists.at n=3A182698
• Left part of the square of the n-th Kaprekar number.at n=23A194218
• Consider a decimal number of k>=2 digits z = d_(k)*10^(k-1) + d_(k-1)*10^(k-2) + ... + d_(2)*10 + d_(1) and the sum y = Sum_{x=2..k} {Sum_{j=1..k-x}{d_(j+x-1)*10^(j-1)} - Sum_{j=1..x-1}{d_(j)*10^(j-1)}}. Sequence lists the numbers for which y = tau(z), where tau(z) is the number of divisors of z.at n=31A248904