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A249972 Numbers whose squares remain squares when prepended with 6 and appended with 25 in base 10. 3
4719393690, 11807874630, 27742949118597124246940412263153220, 3115332518157379156757021966320555019484, 260714191448671809506865610677483779874998640 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
4719393690^2 = 22272676801211816100, 62227267680121181610025 = 249453938995^2.
PROG
(PARI) isok(n) = issquare(eval(concat([6, Str(n^2), 25]))) \\ Michel Marcus, Jul 20 2017
CROSSREFS
Sequence in context: A124977 A128172 A050259 * A233494 A175568 A224472
KEYWORD
nonn,base,more
AUTHOR
Chai Wah Wu, Nov 22 2014
EXTENSIONS
a(5) from Chai Wah Wu, Jul 19 2017
STATUS
approved

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Last modified June 15 01:02 EDT 2024. Contains 373402 sequences. (Running on oeis4.)