A104775 Smallest semiprime containing exactly n 9's.

9, 299, 5999, 19999, 899999, 5999999, 79999999, 299999999, 1999999999, 49999999999, 499999999999, 1999999999999, 29999999999999, 199999999999999, 1999999999999999, 29999999999999999, 599999999999999999

Offset

1,1

Comments

When (if ever) does this differ from A106663? - Andrew S. Plewe, Apr 11 2007

Links

Table of n, a(n) for n=1..17.

Example

a(2)=299 because 299 is the smallest semiprime containing exactly two 9's.

Crossrefs

Sequence in context: A211082 A061685 A183549 * A106663 A196694 A196727

Adjacent sequences: A104772 A104773 A104774 * A104776 A104777 A104778

Keyword

base,nonn

Author

Shyam Sunder Gupta, Apr 24 2005

Status

approved