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A053898 Numbers k such that k^2 contains only digits {1,4,7}. 1
1, 2, 12, 21, 38, 88, 2729, 2036462, 2678521, 1203108962, 343143082067979, 2678520388463521, 1071033028175028538, 2177492084289725902412 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Author?, Source(txt) [Broken link]
MATHEMATICA
Select[Range[1, 10000], ContainsOnly[IntegerDigits[#^2], {1, 4, 7}] &] (* Julien Kluge, Jul 08 2016 *)
CROSSREFS
Cf. A053899.
Sequence in context: A279424 A073041 A284595 * A058413 A053890 A053896
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
Four more terms from Mishima's webpage added by Max Alekseyev, Jan 28 2012
STATUS
approved

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Last modified July 13 12:36 EDT 2024. Contains 374284 sequences. (Running on oeis4.)