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 A218029 Numbers that are equal to the product of the nonzero digits (in base 10) of their square. 1

%I

%S 1,30240,60480,51597803520,687009790646587541893939200,

%T 2639216811747930700939756830720000000,

%U 399953837788563897626396208106026886244605021117749733129069000654848000000000

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

%e 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.

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

%K nonn,base

%O 1,2

%A _Nels Olson_, Oct 18 2012

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Last modified December 12 10:19 EST 2019. Contains 329953 sequences. (Running on oeis4.)