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A053899 Squares composed of digits {1,4,7}. 2
1, 4, 144, 441, 1444, 7744, 7447441, 4147177477444, 7174474747441, 1447471174444717444, 117747174771111771147177144441, 7174471471414771441747147717441, 1147111747441771474111741117114417444, 4741471777144414774147714111744447747417744 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Author?, Source(txt)
FORMULA
a(n) = A053898(n)^2.
CROSSREFS
Cf. A053898.
Sequence in context: A307703 A277948 A083688 * A058414 A053891 A053897
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Mar 15 2000
EXTENSIONS
More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 04 2005
Four more terms from Mishima's webpage added by Max Alekseyev, Jan 28 2012
STATUS
approved

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Last modified July 14 16:35 EDT 2024. Contains 374322 sequences. (Running on oeis4.)