1,1

a(2)=39916800 so 39916800 is the smallest factorial containing exactly two 9's.

Sequence in context: A038819 A091677 A127888 this_sequence A011523 A101641 A034617

Adjacent sequences: A072229 A072230 A072231 this_sequence A072233 A072234 A072235

base,nonn

Shyam Sunder Gupta (guptass(AT)rediffmail.com), Jul 30 2002