9999999998
domain: N
Appears in sequences
- Largest n-digit squarefree number.at n=9A074110
- {Concatenation of n-1 and n+1}/n where n is a member of A069871.at n=20A077192
- Positive integers k such that f(k)+f(k)=concatenation of k and k, where f(k)=k(k+3)/2 (A000096).at n=9A099150
- Numbers k such that k*(k+6) gives the concatenation of two numbers m and m-9.at n=9A116229
- Positive integers a(n) such that number of digits in decimal expansion of a(n)^a(n) is divisible by a(n).at n=19A256162
- Nontotients of the form 10^k - 2.at n=8A292552
- Numbers k such that the digits of sqrt(k) begin with k.at n=14A307371