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A104724 Smallest semiprime containing exactly n 5's. 0
15, 55, 1555, 50555, 505555, 1555555, 55255555, 355555555, 5155555555, 52555555555, 155555555555, 1555555555555, 25555555555555, 155555555555555, 5155555555555555, 25555555555555555, 505555555555555555 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

EXAMPLE

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

CROSSREFS

Sequence in context: A141839 A080698 A082235 * A106659 A119136 A036522

Adjacent sequences:  A104721 A104722 A104723 * A104725 A104726 A104727

KEYWORD

base,nonn

AUTHOR

Shyam Sunder Gupta (guptass(AT)rediffmail.com), Apr 24 2005

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Last modified February 16 17:48 EST 2012. Contains 205939 sequences.