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A249972
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Numbers whose squares remain squares when prepended with 6 and appended with 25 in base 10.
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3
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OFFSET
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1,1
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LINKS
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EXAMPLE
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4719393690^2 = 22272676801211816100, 62227267680121181610025 = 249453938995^2.
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PROG
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(PARI) isok(n) = issquare(eval(concat([6, Str(n^2), 25]))) \\ Michel Marcus, Jul 20 2017
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CROSSREFS
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KEYWORD
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nonn,base,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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