A055617 a(n)= A*10^(3*n)+B with A=(10^(3*n)-10^n) and B=10^(2*n).

990100, 999900010000, 999999000001000000, 999999990000000100000000, 999999999900000000010000000000, 999999999999000000000001000000000000, 999999999999990000000000000100000000000000

Offset: 1

Author

Ulrich Schimke (ulrschimke(AT)aol.com)

Keywords

• nonn
• easy

Examples

			a(2) = (10^6-10^2)*10^6+10^4 = 999900010000.
Note that 999900010000 = 999900^2 + 010000^2 (see A055616).
		

Crossrefs

Subsequence of A055616.

Programs

PARI

a(n) = (10^(3*n)-10^n)*10^(3*n) + 10^(2*n) \\ Michel Marcus, Jul 23 2013