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

1,1

Links

Table of n, a(n) for n=1..7.

Example

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

Prog

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

Crossrefs

Subsequence of A055616.

Sequence in context: A106782 A154674 A236034 * A055618 A341551 A216276

Adjacent sequences: A055614 A055615 A055616 * A055618 A055619 A055620

Keyword

nonn,easy

Author

Ulrich Schimke (ulrschimke(AT)aol.com)

Status

approved