A242078 Smallest square number > 10*a(n-1) with a(1) = 1.
1, 16, 169, 1764, 17689, 177241, 1774224, 17749369, 177502329, 1775105424, 17751298756, 177513070329, 1775132540281, 17751332312289, 177513333968569, 1775133399758224, 17751334196261689, 177513342503762329
Offset: 1
Keywords
Examples
Term after 169 cannot be 1681 because 1681 is less than 10 times 169.
Links
- Jon E. Schoenfield, Table of n, a(n) for n = 1..250
Programs
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Magma
nMax:=100; a:=1; for n in [1..nMax] do a:=(Isqrt(a*10)+1)^2; a; end for; // Jon E. Schoenfield, May 06 2014
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Mathematica
NestList[Ceiling[Sqrt[10#]]^2&,1,20] (* Harvey P. Dale, Sep 03 2020 *)
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PARI
lista(nn, k=10) = {a=1; for (n=1, nn, print1(a, ", "); a = (sqrtint(a*k)+1)^2;);} \\ Michel Marcus, May 06 2014