A218029 Numbers that are equal to the product of the nonzero digits (in base 10) of their square.

1, 30240, 60480, 51597803520, 687009790646587541893939200, 2639216811747930700939756830720000000, 399953837788563897626396208106026886244605021117749733129069000654848000000000

Offset: 1

Author

Nels Olson, Oct 18 2012

Keywords

• nonn
• base

Examples

			For n=30240, n^2 = 914,457,600; the product of the nonzero digits of this square, 9*1*4*4*5*7*6 = 30240 = n.
		

Crossrefs

Special case of A218013 where the ratio of the digit-product to the original number is 1. Related to A218072.