998999

Appears in sequences

• a(n) = 100^n - 10^n - 1.at n=2A086695
• k times k+4 gives the concatenation of two numbers m and m-5.at n=4A116254
• Numbers k such that (k - digitsum(k))(k + digitsum(k)) contains k as a substring.at n=19A334249
• Numbers k whose digits can be split into substrings so that the sum of these substrings raised to consecutive powers (1, 2, 3, ...) is the number k itself.at n=36A377012