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A028845 Iterated product of digits of n is a nonzero square. 3
1, 4, 9, 11, 14, 19, 22, 27, 33, 39, 41, 72, 89, 91, 93, 98, 111, 114, 119, 122, 127, 133, 139, 141, 172, 189, 191, 193, 198, 212, 217, 221, 249, 266, 271, 277, 294, 313, 319, 331, 333, 338, 346, 364, 379, 383, 391, 397, 411, 429, 436, 463, 492, 626, 634, 643 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..55.

EXAMPLE

E.g. 27 -> 2*7 = 14 -> 1*4 = 4 is a square.

CROSSREFS

Cf. A031347, A050626, A028837.

Sequence in context: A010438 A005241 A199595 * A050626 A050627 A036435

Adjacent sequences:  A028842 A028843 A028844 * A028846 A028847 A028848

KEYWORD

nonn,base,easy

AUTHOR

N. J. A. Sloane.

EXTENSIONS

Extended (and corrected) by Patrick De Geest, Jun 15 1999.

STATUS

approved

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Last modified May 19 02:47 EDT 2013. Contains 225428 sequences.