A104724 Smallest semiprime containing exactly n 5's.

15, 55, 1555, 50555, 505555, 1555555, 55255555, 355555555, 5155555555, 52555555555, 155555555555, 1555555555555, 25555555555555, 155555555555555, 5155555555555555, 25555555555555555, 505555555555555555

Offset

1,1

Links

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

Example

a(2)=55 because 55 is the smallest semiprime containing exactly two 5's.

Crossrefs

Sequence in context: A080698 A082235 A219592 * A106659 A119136 A036522

Adjacent sequences: A104721 A104722 A104723 * A104725 A104726 A104727

Keyword

base,nonn

Author

Shyam Sunder Gupta, Apr 24 2005

Status

approved