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A218029 Numbers that are equal to the product of the nonzero digits (in base 10) of their square. 1
1, 30240, 60480, 51597803520, 687009790646587541893939200, 2639216811747930700939756830720000000, 399953837788563897626396208106026886244605021117749733129069000654848000000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

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.

Sequence in context: A113286 A027687 A190475 * A323991 A109485 A156429

Adjacent sequences:  A218026 A218027 A218028 * A218030 A218031 A218032

KEYWORD

nonn,base

AUTHOR

Nels Olson, Oct 18 2012

STATUS

approved

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Last modified November 14 04:40 EST 2019. Contains 329108 sequences. (Running on oeis4.)