999999000000
domain: N
Appears in sequences
- Numbers k such that k*(k+2) gives the concatenation of two numbers m and m-2.at n=15A116273
- Numbers j such that ceiling(j^(1/k)) divides j for all integers k >= 1.at n=18A261206
- a(n) = 100^n - 10^n.at n=6A276352
- Oblong (or pronic) numbers of the form x_n.y_n where z_n indicates the digit z repeated n times.at n=21A289980