cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-1 of 1 results.

A242078 Smallest square number > 10*a(n-1) with a(1) = 1.

Original entry on oeis.org

1, 16, 169, 1764, 17689, 177241, 1774224, 17749369, 177502329, 1775105424, 17751298756, 177513070329, 1775132540281, 17751332312289, 177513333968569, 1775133399758224, 17751334196261689, 177513342503762329
Offset: 1

Views

Author

J. Lowell, May 03 2014

Keywords

Examples

			Term after 169 cannot be 1681 because 1681 is less than 10 times 169.
		

Crossrefs

Cf. other sequences with smallest square > k*a(n-1): A175627 (k=2), A060867 (k=4).

Programs

  • 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
  • Mathematica
    NestList[Ceiling[Sqrt[10#]]^2&,1,20] (* Harvey P. Dale, Sep 03 2020 *)
  • PARI
    lista(nn, k=10) = {a=1; for (n=1, nn, print1(a, ", "); a = (sqrtint(a*k)+1)^2;);} \\ Michel Marcus, May 06 2014
    
Showing 1-1 of 1 results.