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 1-2 of 2 results.

A048349 a(n)^2 is the smallest square containing exactly n 4's.

Original entry on oeis.org

2, 12, 38, 212, 2538, 6888, 66592, 210771, 2059962, 6696592, 21081538, 209868112, 664488107, 3800598038, 18613286762, 209820981888, 666669703412, 666516649788, 6666894662768, 49400874945738, 156347319914172, 210747466045038, 5868938950479212, 21081850261503238, 66666663966850212
Offset: 1

Views

Author

Patrick De Geest, Mar 15 1999

Keywords

Links

Crossrefs

Cf. A036511, A034984.

Programs

  • Mathematica
    a[n_] := Block[{k=1}, While[DigitCount[k^2, 10, 4] != n, k++]; k]; Array[a, 7] (* Giovanni Resta, Jul 27 2018 *)

Extensions

More terms from Jon E. Schoenfield, Jan 14 2009
a(17)-a(20) from Giovanni Resta, Jul 27 2018
a(21)-a(25) from Max Alekseyev, Mar 06 2025

A034985 Smallest square starting with a string of n 4's.

Original entry on oeis.org

4, 441, 444889, 44448889, 4444488889, 444444888889, 44444448888889, 444444441586201, 444444444888888889, 44444444448888888889, 4444444444488888888889, 44444444444490000019684, 4444444444444783631754841, 4444444444444488888888888889, 44444444444444463221377563664, 44444444444444448888888888888889, 4444444444444444488888888888888889
Offset: 1

Views

Author

Patrick De Geest, Nov 15 1998

Keywords

Crossrefs

Cf. A034984.

Extensions

More terms from Francisco Salinas (franciscodesalinas(AT)hotmail.com), Dec 23 2001
Showing 1-2 of 2 results.

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