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 1-3 of 3 results.

A103953 Smallest perfect power b^e such that b^e+n is also a perfect power, or 0 if no such perfect power exists.

Original entry on oeis.org

8, 25, 1, 4, 4, 0, 1, 1, 16, 2187, 16, 4, 36, 0, 1, 9, 8, 9, 8, 16, 4, 27, 4, 1, 100, 1, 9, 4, 196, 6859, 1, 4, 16, 0, 1, 64, 27, 1331, 25, 9, 8, 0, 441, 81, 4, 243, 81, 1, 32, 0, 49, 144, 676, 27, 9, 8, 64, 0, 841, 4, 64, 0, 1, 36, 16, 0, 1089
Offset: 1

Views

Author

Max Alekseyev, Feb 22 2005

Keywords

Comments

a(A074981(n)) = 0.

Crossrefs

Cf. A074954, A001597, A076444, A023056.

Formula

a(n) = A074954(n)-n, if A074954(n)>0; a(n)=0, if A074954(n)=0.

Extensions

Offset corrected by Mohammed Yaseen, Aug 09 2023

A103952 Smallest powerful number such that a(n)-n is also powerful.

Original entry on oeis.org

9, 27, 4, 8, 9, 214375, 8, 9, 25, 2197, 27, 16, 49, 30459375, 16, 25, 25, 27, 27, 36, 25, 49, 27, 25, 125, 27, 36, 32, 225, 6889, 32, 36, 49, 899236854961, 36, 72, 64, 1369, 64, 49, 49, 518436000667, 243, 108, 49, 289, 72, 49, 81, 675, 100, 196, 125, 81, 64, 64
Offset: 1

Views

Author

Max Alekseyev, Feb 22 2005

Keywords

Comments

Sister sequence of a(n)-n is given by A076444.
a(110) > 10^22. - Donovan Johnson, Nov 19 2011

Links

Crossrefs

Cf. A076444, A074954.

Formula

a(n) = A076444(n)+n.

Extensions

Offset corrected by Donovan Johnson, Nov 19 2011

A103955 a(n) is the least k such that k-n and k are adjacent powerful numbers.

Original entry on oeis.org

9, 27, 4, 8, 32, 214375, 16, 72, 25, 2197, 3136, 512, 49, 30459375, 64, 144, 529, 243, 100, 21316, 1352, 100489, 648, 1024, 169, 11907, 196, 1000, 36992, 6889, 392, 288, 12967201, 899236854961, 324, 900, 117649, 3125, 10648, 2744, 841, 518436000667
Offset: 1

Views

Author

Max Alekseyev, Feb 22 2005

Keywords

Comments

Sister sequence of a(n)-n is given by A103954.
a(105) > 10^22. - Donovan Johnson, Nov 19 2011

Links

Crossrefs

Cf. A001694, A103952, A074954, A103954, A023056.

Extensions

Offset corrected by Donovan Johnson, Nov 19 2011
Showing 1-3 of 3 results.

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

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