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.

User: Hannah Ko

Hannah Ko's wiki page.

Hannah Ko has authored 4 sequences.

A234811 (6^n - 1)^n.

Original entry on oeis.org

1, 5, 1225, 9938375, 2812412850625, 28412011938974609375, 10313098426045900054366890625, 134710177671603826682045331123397109375, 63339984974231689005132970549727976493235812890625, 1072138503990252055371856714088806945958716851785209488787109375
Offset: 0

Views

Author

Hannah Ko, Apr 19 2014

Keywords

Examples

			a(3) = 215^3 = 9938375.

Crossrefs

Cf. A055601, A060613, A240091, A241095, A241098.

Programs

A241098 (4^n - 1)^n.

Original entry on oeis.org

1, 3, 225, 250047, 4228250625, 1120413075641343, 4715453174592516890625, 316777275155162685106909462527, 340240830764391036687105719527812890625, 5845805845679338940092384222659294205213252255743, 1606922719369349023077959288770050490334792256259918212890625
Offset: 0

Views

Author

Hannah Ko, Apr 15 2014

Keywords

Examples

			a(3) = 63^3 = 250047.

Crossrefs

Cf. A055601, A060613, A241095, A240091.

Programs

Formula

(4^n - 1)^n

A241095 a(n) = (5^n - 1)^n.

Original entry on oeis.org

1, 4, 576, 1906624, 151613669376, 297546691796890624, 14546328186912540283109376, 17761976839391142146587243652890624, 542089984111981439129333008468155364987109376, 413588400456285638417956135979678948104381423950212890624
Offset: 0

Views

Author

Hannah Ko, Apr 15 2014

Keywords

Comments

Number of n X n {-2,-1,0,1,2} matrices with no zero rows.

Crossrefs

Cf. A055601, A060613, A240091.

Programs

  • Mathematica
    Join[{1},Table[(5^n-1)^n,{n,10}]] (* Harvey P. Dale, May 24 2023 *)

Extensions

More terms from Alois P. Heinz, Apr 23 2014

A240091 a(n) = (10^n - 1)^n.

Original entry on oeis.org

1, 9, 9801, 997002999, 9996000599960001, 9999500009999900000499999, 999994000014999980000014999994000001, 9999993000002099999650000034999997900000069999999, 9999999200000027999999440000006999999944000000279999999200000001
Offset: 0

Views

Author

Hannah Ko, Mar 31 2014

Keywords

Examples

			a(3) = 999^3 = 997002999.

Crossrefs

Cf. A024115.

Extensions

Extended by N. J. A. Sloane, Apr 01 2014

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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