999900010000
domain: N
Appears in sequences
- Numbers, with an even number of digits, that are the sum of the squares of their two halves (leading zeros allowed only for the second half).at n=13A055616
- a(n)= A*10^(3*n)+B with A=(10^(3*n)-10^n) and B=10^(2*n).at n=1A055617
- Positive integers of the form x*10^k + y which also equal x^2 + y^2 (x, y and k being positive integers).at n=25A275986