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A117755
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Squares which remain squares when each digit is replaced by the next digit.
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8
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9, 25, 2025, 13225, 1974025, 4862025, 6943225, 60415182025, 207612366025, 916408817340025, 9960302475729225, 153668543313582025, 1978088677245614025, 13876266042653742025, 20761288044852366025
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Replace 1 by 2, 2 by 3,..., 8 by 9 and 9 by 0.
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LINKS
| Max Alekseyev, Table of n, a(n) for n=1..20
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EXAMPLE
| 13225 is in the sequence because (1) it is a square and (2)if we transform it we get 24336 and this is also a square
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MATHEMATICA
| Select[Range[500000]^2, IntegerQ[(FromDigits[((1 + IntegerDigits[ # ]) /. 10-> 0])^1/2 &] - Harvey P. Dale (hpd1(AT)nyu.edu), Jan 21 2007
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CROSSREFS
| Sequence in context: A201807 A048056 A038534 * A144114 A144701 A022421
Adjacent sequences: A117752 A117753 A117754 * A117756 A117757 A117758
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KEYWORD
| base,nonn
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AUTHOR
| Luc Stevens (lms022(AT)yahoo.com), Apr 14 2006
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EXTENSIONS
| More terms from Harvey P. Dale (hpd1(AT)nyu.edu), Jan 21 2007
3 more terms from Donovan Johnson (donovan.johnson(AT)yahoo.com), Apr 03 2008
a(13)..a(20) and b-file from Max Alekseyev (maxale(AT)gmail.com), Oct 22 2008
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