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A028845 Iterated product of digits of n is a nonzero square. +0
4
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; listen)
OFFSET

0,2

EXAMPLE

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

CROSSREFS

Cf. A031347, A050626, A028837.

Adjacent sequences: A028842 A028843 A028844 this_sequence A028846 A028847 A028848

Sequence in context: A010431 A010438 A005241 this_sequence A050626 A050627 A036435

KEYWORD

nonn,base,easy

AUTHOR

njas

EXTENSIONS

Extended (and corrected) by Patrick De Geest (pdg(AT)worldofnumbers.com), Jun 15 1999.

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Last modified October 11 13:47 EDT 2008. Contains 144830 sequences.


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