9999998

Appears in sequences

• Largest n-digit squarefree number.at n=6A074110
• {Concatenation of n-1 and n+1}/n where n is a member of A069871.at n=14A077192
• Largest n-digit semiprime.at n=6A098450
• Positive integers k such that f(k)+f(k)=concatenation of k and k, where f(k)=k(k+3)/2 (A000096).at n=6A099150
• Numbers k such that k concatenated with k-4 gives the product of two numbers which differ by 5.at n=15A116130
• Numbers k such that k*(k+6) gives the concatenation of two numbers m and m-9.at n=6A116229
• n times n+5 gives the concatenation of two numbers m and m-6.at n=21A116249
• Numbers k such that k*(k+4) gives the concatenation of two numbers m and m-3.at n=17A116267
• Numbers k such that k*(k+3) gives the concatenation of a number m with itself.at n=15A116287
• a(n) is the largest n-digit number with exactly 4 divisors.at n=6A182648
• Positive integers a(n) such that number of digits in decimal expansion of a(n)^a(n) is divisible by a(n).at n=13A256162
• Nontotients of the form 10^k - 2.at n=5A292552
• Composite numbers that divide the concatenation of the reverse of their ascending order prime factors, with repetition.at n=8A372046
• Composite numbers k such that k's prime factors are distinct, the digits of k are in nonincreasing order while the digits of the concatenation of k's ascending order prime factors are in nondecreasing order.at n=27A372295