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.

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A074109 Smallest n-digit squarefree number.

Original entry on oeis.org

2, 10, 101, 1001, 10001, 100001, 1000001, 10000001, 100000001, 1000000001, 10000000001, 100000000002, 1000000000001, 10000000000001, 100000000000001, 1000000000000001, 10000000000000001, 100000000000000001
Offset: 1

Views

Author

Amarnath Murthy, Aug 26 2002

Keywords

Comments

For n>=3, a(n) = 10^(n-1)+1 unless n-1 is in A086982. - Robert Israel, Mar 23 2020

Crossrefs

Cf. A074110, A086982.

Programs

  • Mathematica
    Join[{2}, Table[x = 10^n; k = 0; While[! SquareFreeQ[y = x + k], k++]; y, {n, 19}]] (* Jayanta Basu, Aug 01 2013 *)

Extensions

More terms from Matthew Conroy, Aug 27 2002
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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