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A038678
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Squares ending in a different nonzero square.
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5
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49, 64, 81, 121, 144, 169, 225, 289, 324, 361, 441, 484, 529, 625, 729, 784, 841, 961, 1024, 1089, 1225, 1369, 1444, 1521, 1681, 1764, 1849, 1936, 2025, 2116, 2209, 2304, 2401, 2601, 2704, 2809, 2916, 3025, 3136, 3249, 3364, 3481, 3721, 3844, 3969, 4225
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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15^2 = 225 ends with 25 = 5^2.
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MAPLE
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q:= n-> (s-> ormap(x-> (t-> t>0 and issqr(t))(parse(x))
, [s[i..-1]$i=2..length(s)]))(""||n):
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MATHEMATICA
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ds[n_] := DeleteCases[NestWhileList[FromDigits[Rest[IntegerDigits[#]]] &, n, # > 9 &], 0]; Select[Range[4, 65]^2, Or @@ IntegerQ /@ Sqrt[Rest[ds[#]]] &] (* Jayanta Basu, Jul 10 2013 *)
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PROG
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(PARI) issqend(n) = my(p=10, q); for(k=1, #Str(n)-1, if ((q=(n % p)) && issquare(q), return (1)); p*=10);
isok(n) = issquare(n) && issqend(n); \\ Michel Marcus, Mar 17 2020
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CROSSREFS
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KEYWORD
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nonn,base,easy
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AUTHOR
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STATUS
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approved
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