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A053951 Squares composed of digits {4,5,7}. 2
4, 7744, 47444544, 47775744, 57577744, 4755757444, 44547775545744, 7557757477754457744, 55744775754747577744, 74474545477575775744575745574544 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..10.

Author?, Source(txt)

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

H. Mishima, Sporadic tridigital solutions

FORMULA

a(n) = A053950(n)^2

CROSSREFS

Cf. A053950.

Sequence in context: A272165 A058440 A058464 * A058460 A115050 A072724

Adjacent sequences:  A053948 A053949 A053950 * A053952 A053953 A053954

KEYWORD

nonn,base,more

AUTHOR

Patrick De Geest, Mar 15 2000.

EXTENSIONS

More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 04 2005

One more term from Mishima's webpage added by Max Alekseyev, Jan 28 2012

STATUS

approved

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Last modified September 21 15:13 EDT 2017. Contains 292300 sequences.