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A053881 Squares composed of digits {1,2,4}. 2
1, 4, 121, 144, 441, 1444, 114244, 2214144, 11142244, 121242121, 421111441, 1111422244, 44424414441, 111114222244, 11111142222244, 214222214414224, 242441124211441, 411244411422244, 1111111422222244, 2111211444222241 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..20.

P. De Geest, Squares containing at most three distinct digits, Index entries for related sequences

CROSSREFS

Cf. A053880.

Sequence in context: A006607 A239187 A062081 * A075114 A017186 A098839

Adjacent sequences:  A053878 A053879 A053880 * A053882 A053883 A053884

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, Mar 15 2000.

STATUS

approved

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Last modified December 20 13:42 EST 2014. Contains 252266 sequences.